Fix cli-non-interactive syntax in uninstallation docs (add -c flag)

The cli-non-interactive script passes arguments directly to psql, which
interprets positional arguments as database names, not SQL commands.
Without the -c flag, commands like:

  /matrix/postgres/bin/cli-non-interactive 'DROP DATABASE foo;'

fail with: FATAL: database "DROP DATABASE foo;" does not exist

The correct syntax requires -c to pass a command:

  /matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE foo;'

This mistake was originally introduced in c399992542
when the matrix-bridge-mautrix-hangouts role was removed. That commit's
uninstallation docs were then used as a template and the error propagated
to subsequent removal documentation for other bridges and components.

docs/configuring-playbook-bridge-go-skype-bridge.md

@@ -22,5 +22,5 @@ systemctl disable --now matrix-go-skype-bridge.service
 
 rm -rf /matrix/go-skype-bridge
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_go_skype_bridge;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_go_skype_bridge;'
 ```

docs/configuring-playbook-bridge-mautrix-facebook.md

@@ -28,5 +28,5 @@ systemctl disable --now matrix-mautrix-facebook.service
 
 rm -rf /matrix/mautrix-facebook
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_mautrix_facebook;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_mautrix_facebook;'
 ```

docs/configuring-playbook-bridge-mautrix-hangouts.md

@@ -23,5 +23,5 @@ systemctl disable --now matrix-mautrix-hangouts.service
 
 rm -rf /matrix/mautrix-hangouts
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_mautrix_hangouts;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_mautrix_hangouts;'
 ```

docs/configuring-playbook-bridge-mautrix-instagram.md

@@ -29,5 +29,5 @@ systemctl disable --now matrix-mautrix-instagram.service
 
 rm -rf /matrix/mautrix-instagram
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_mautrix_instagram;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_mautrix_instagram;'
 ```

docs/configuring-playbook-bridge-mx-puppet-discord.md

@@ -27,5 +27,5 @@ systemctl disable --now matrix-mx-puppet-discord.service
 
 rm -rf /matrix/mx-puppet-discord
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_mx_puppet_discord;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_mx_puppet_discord;'
 ```

docs/configuring-playbook-bridge-mx-puppet-instagram.md

@@ -26,5 +26,5 @@ systemctl disable --now matrix-mx-puppet-instagram.service
 
 rm -rf /matrix/mx-puppet-instagram
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_mx_puppet_instagram;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_mx_puppet_instagram;'
 ```

docs/configuring-playbook-bridge-mx-puppet-slack.md

@@ -29,5 +29,5 @@ systemctl disable --now matrix-mx-puppet-slack.service
 
 rm -rf /matrix/mx-puppet-slack
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_mx_puppet_slack;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_mx_puppet_slack;'
 ```

docs/configuring-playbook-bridge-mx-puppet-twitter.md

@@ -25,5 +25,5 @@ systemctl disable --now matrix-mx-puppet-twitter.service
 
 rm -rf /matrix/mx-puppet-twitter
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_mx_puppet_twitter;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_mx_puppet_twitter;'
 ```

docs/configuring-playbook-sliding-sync-proxy.md

@@ -28,5 +28,5 @@ systemctl disable --now matrix-sliding-sync.service
 
 rm -rf /matrix/sliding-sync
 
-/matrix/postgres/bin/cli-non-interactive 'DROP DATABASE matrix_sliding_sync;'
+/matrix/postgres/bin/cli-non-interactive -c 'DROP DATABASE matrix_sliding_sync;'
 ```