Update docker-compose-common-components.yaml (#982)

Use the correct syntax to check for the file existing

Signed-off-by: C. Eric Mathey <[email protected]>

Author: cemathey

docker-compose-common-components.yaml

@@ -55,7 +55,7 @@ services:
     command: maintenance
     restart: always
     healthcheck:
-      test: [ "CMD-SHELL", "-f /code/rconweb/maintenance-container-healthy ]" ]
+      test: [ "CMD-SHELL", "test -f /code/rconweb/maintenance-container-healthy" ]
       start_period: 30s
       interval: 15s
       timeout: 30s