Fixed syntax error in yaml test def

Fixed:

yaml.scanner.ScannerError: while scanning a simple key
  in "tests/tests_api/hivemind/tavern_full_sync/bridge_api_patterns/get_account_posts/replies/jeffjagoe.tavern.yaml", line 7, column 3
could not find expected ':'
  in "tests/tests_api/hivemind/tavern_full_sync/bridge_api_patterns/get_account_posts/replies/jeffjagoe.tavern.yaml", line 10, column 3

hivemind/tavern_full_sync/bridge_api_patterns/get_account_posts/replies/jeffjagoe.tavern.yaml

@@ -4,7 +4,7 @@
   marks:
     - fullsynctest # slow_calls file - 3.168s
 
-  includes:`
+  includes:
     - !include ../../../common.yaml
 
   stages: