Reuse command to show RunningScriptWindow

This is a temporal commit just to be able to show the dialog without
having to code a new command.
Must not be committed in the final version

src/app/commands/cmd_grid.cpp

@@ -52,6 +52,7 @@ protected:
     docPref.grid.snap(newValue);
 
     StatusBar::instance()->showSnapToGridWarning(newValue);
+    StatusBar::instance()->showRunningScriptsWindow(newValue);
   }
 };