fix ok and cancel button for block properties

qtgui/submenus.py

@@ -321,8 +321,8 @@ class SecondaryTemporaryTempoChangeMenu(Submenu):
         self.done(True)
 
 class BlockPropertiesEdit(Submenu):
-    def __init__(self, mainWindow, staticExportItem, hasOkCancelButtons=True):
+    def __init__(self, mainWindow, staticExportItem):
-        super().__init__(mainWindow, "")
+        super().__init__(mainWindow, "", hasOkCancelButtons=True)
 
         self.mainWindow = mainWindow
         self.staticExportItem = staticExportItem