Various event binding fixes for context menus. It's still a mess, but it's not as bad of a mess.

(cherry picked from commit 081e32da6f)

gui/builtinContextMenus/ammoPattern.py

@@ -8,7 +8,6 @@ class AmmoPattern(ContextMenu):
     def __init__(self):
         self.mainFrame = gui.mainFrame.MainFrame.getInstance()
 
-
     def display(self, srcContext, selection):
         if srcContext not in ("marketItemGroup", "marketItemMisc") or self.mainFrame.getActiveFit() is None:
             return False
@@ -33,5 +32,4 @@ class AmmoPattern(ContextMenu):
     def getBitmap(self, context, selection):
         return None
 
-
 AmmoPattern.register()