Update firstsetup.py

Author: BenjaminHalko

firstsetup.py

@@ -115,7 +115,7 @@ def Checkmark(self,checkmark,setting):
 
     def GetDolphin(self):
         file = QFileDialog() 
-        file.setFileMode(QFileDialog.AnyFile)
+        file.setFileMode(QFileDialog.ExistingFile)
         file.setNameFilter(ChooseFromOS(["Dolphin (Dolphin.exe)","Dolphin (Dolphin.app)","Dolphin (dolphin-emu)"]))
         if file.exec_():
             editor.dolphinPath = file.selectedFiles()[0]