Allow for people to easily unset the mautrix-meta displayname suffix

Previously, unsetting `matrix_mautrix_meta_messenger_bridge_displayname_suffix`
or (`matrix_mautrix_meta_instagram_bridge_displayname_suffix`) variable would
make you end up witha trailing space in `displayname`.

It's possible that mautrix-meta trims this, but I haven't checked. It's
better not to risk it anyway.

roles/custom/matrix-bridge-mautrix-meta-instagram/defaults/main.yml

@@ -189,7 +189,7 @@ matrix_mautrix_meta_instagram_bridge_displayname_suffix: |-
     })[matrix_mautrix_meta_instagram_meta_mode]
   }}
 
-matrix_mautrix_meta_instagram_bridge_displayname_template: '{% raw %}{{or .DisplayName .Username "Unknown user"}}{% endraw %} {{ matrix_mautrix_meta_instagram_bridge_displayname_suffix }}'
+matrix_mautrix_meta_instagram_bridge_displayname_template: '{% raw %}{{or .DisplayName .Username "Unknown user"}}{% endraw %}{{ (" " ~ matrix_mautrix_meta_instagram_bridge_displayname_suffix) if matrix_mautrix_meta_instagram_bridge_displayname_suffix else "" }}'
 
 # The prefix for commands. Only required in non-management rooms.
 # If set to "default", will be determined based on meta -> mode (`matrix_mautrix_meta_instagram_meta_mode`):

roles/custom/matrix-bridge-mautrix-meta-messenger/defaults/main.yml

@@ -189,7 +189,7 @@ matrix_mautrix_meta_messenger_bridge_displayname_suffix: |-
     })[matrix_mautrix_meta_messenger_meta_mode]
   }}
 
-matrix_mautrix_meta_messenger_bridge_displayname_template: '{% raw %}{{or .DisplayName .Username "Unknown user"}}{% endraw %} {{ matrix_mautrix_meta_messenger_bridge_displayname_suffix }}'
+matrix_mautrix_meta_messenger_bridge_displayname_template: '{% raw %}{{or .DisplayName .Username "Unknown user"}}{% endraw %}{{ (" " ~ matrix_mautrix_meta_messenger_bridge_displayname_suffix) if matrix_mautrix_meta_messenger_bridge_displayname_suffix else "" }}'
 
 # The prefix for commands. Only required in non-management rooms.
 # If set to "default", will be determined based on meta -> mode (`matrix_mautrix_meta_messenger_meta_mode`):