Update VisualStudio.gitignore

I have no idea what this is doing here, totally unrelated to Visual Studio. There is a special OSX gitignore file that you can use.

VisualStudio.gitignore

@@ -175,6 +175,3 @@ Desktop.ini
 
 # Recycle Bin used on file shares
 $RECYCLE.BIN/
-
-# Mac crap
-.DS_Store