Fix Go-NEB variable definitions using the wrong type

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/969

roles/matrix-bot-go-neb/defaults/main.yml

@@ -45,7 +45,7 @@ matrix_bot_go_neb_storage_database: "{{
 # Generate one as described in
 # https://github.com/spantaleev/matrix-docker-ansible-deploy/blob/master/docs/configuring-playbook-dimension.md#access-token
 # via curl. With the element method, you might run into decryption problems (see https://github.com/matrix-org/go-neb#quick-start)
-matrix_bot_go_neb_clients: {}
+matrix_bot_go_neb_clients: []
 #  - UserID: "@goneb:{{ matrix_domain }}"
 #    AccessToken: "MDASDASJDIASDJASDAFGFRGER"
 #    DeviceID: "DEVICE1"
@@ -68,7 +68,7 @@ matrix_bot_go_neb_clients: {}
 # Delete or modify this list as appropriate.
 # See the docs for /configureAuthRealm for the full list of options:
 # https://matrix-org.github.io/go-neb/pkg/github.com/matrix-org/go-neb/api/index.html#ConfigureAuthRealmRequest
-matrix_bot_go_neb_realms: {}
+matrix_bot_go_neb_realms: []
 #  - ID: "github_realm"
 #    Type: "github"
 #    Config: {} # No need for client ID or Secret as Go-NEB isn't generating OAuth URLs
@@ -78,7 +78,7 @@ matrix_bot_go_neb_realms: {}
 # The full list of options are shown below: there is no single HTTP endpoint
 # which maps to this section.
 # https://matrix-org.github.io/go-neb/pkg/github.com/matrix-org/go-neb/api/index.html#Session
-matrix_bot_go_neb_sessions: {}
+matrix_bot_go_neb_sessions: []
 #  - SessionID: "your_github_session"
 #    RealmID: "github_realm"
 #    UserID: "@YOUR_USER_ID:{{ matrix_domain }}" # This needs to be the username of the person that's allowed to use the !github commands
@@ -91,7 +91,7 @@ matrix_bot_go_neb_sessions: {}
 # Delete or modify this list as appropriate.
 # See the docs for /configureService for the full list of options:
 # https://matrix-org.github.io/go-neb/pkg/github.com/matrix-org/go-neb/api/index.html#ConfigureServiceRequest
-matrix_bot_go_neb_services: {}
+matrix_bot_go_neb_services: []
 #  - ID: "echo_service"
 #    Type: "echo"
 #    UserID: "@goneb:{{ matrix_domain }}"