Fix event sssigned multiple times to the save button

If multiple saves were opened in one session, the save button
would get the event several times instead of just once.

sd3save_editor/gui/mainwindow.py

@@ -17,6 +17,7 @@ def __init__(self):
         self.ui.setupUi(self)
         self.initFileOpenEvents()
         self.initChangeNameInput()
+        self.initSaveEvent()
         self.saveIndex = None
         self.guiData = {
             "currentHp": SpinboxElement(
@@ -176,7 +177,6 @@ def openFileDialog(self):
                 self.ui.actionSave.setEnabled(True)
                 self.initData()
                 self.setTableData()
-                self.initSaveEvent()
                 self.initSaveEntryComboBox()
             except Exception as ex:
                 QMessageBox.warning(self, "Can't open Seiken3 save", str(ex))