Remove trailing comma in FunctionId.cs

src/Workspaces/Core/Portable/Log/FunctionId.cs

@@ -459,6 +459,6 @@ internal enum FunctionId
         Intellisense_AsyncCompletion_Data,
         Intellisense_CompletionProviders_Data
         SnapshotService_IsExperimentEnabledAsync,
-        PartialLoad_FullyLoaded,
+        PartialLoad_FullyLoaded
     }
 }