fixed typo

Author: hephaex

commons/service-defs/tensorboard.json

@@ -11,7 +11,7 @@
     "{runtime_path}",
     "-m", "tensorboard.main",
     "--host", "0.0.0.0",
-    "--port", "{ports[0]}",
+    "--port", "{ports[0]}"
   ],
   "allowed_arguments": [
     "--logdir"