Fix clip editor interface being broken by a71f072

Please do test commits before committing them.
This is second working day in a row which was started with
solving issues caused by untested patches.

release/scripts/startup/bl_ui/space_clip.py

@@ -183,7 +183,8 @@ class CLIP_MT_masking_editor_menus(Menu):
 
     @staticmethod
     def draw_menus(layout, context):
-        layout = self.layout
+        sc = context.space_data
+        clip = sc.clip
 
         layout.menu("CLIP_MT_view")