Fix sqlite usage for mautrix-facebook/mautrix-telegram

Regression since 2d99ade72f and 9bf8ce878e, respectively.

When SQLite is to be used, these bridges expect an `sqlite://`
connection string, and not a plain file name (path), like Appservice
Discord and mautrix-whatsapp do.

roles/matrix-bridge-mautrix-facebook/defaults/main.yml

@@ -55,7 +55,7 @@ matrix_mautrix_facebook_postgres_connection_string: 'postgresql://{{ matrix_maut
 
 matrix_mautrix_facebook_appservice_database: "{{
 	{
-		'sqlite': matrix_mautrix_facebook_sqlite_database_path_in_container,
+		'sqlite': ('sqlite://' + matrix_mautrix_facebook_sqlite_database_path_in_container),
 		'postgres': matrix_mautrix_facebook_postgres_connection_string,
 	}[matrix_mautrix_facebook_database_engine]
 }}"

roles/matrix-bridge-mautrix-telegram/defaults/main.yml

@@ -66,7 +66,7 @@ matrix_mautrix_telegram_postgres_connection_string: 'postgresql://{{ matrix_maut
 
 matrix_mautrix_telegram_appservice_database: "{{
 	{
-		'sqlite': matrix_mautrix_telegram_sqlite_database_path_in_container,
+		'sqlite': ('sqlite://' + matrix_mautrix_telegram_sqlite_database_path_in_container),
 		'postgres': matrix_mautrix_telegram_postgres_connection_string,
 	}[matrix_mautrix_telegram_database_engine]
 }}"