Swap order of ctrl-w and ctrl-f4

This allows `Ctrl-W` to appear in the system menu again until
the atom-shell issue with function keys is fixed.

Refs atom/atom-shell#485
Closes #3283

keymaps/win32.cson

@@ -25,8 +25,8 @@
   'ctrl-n': 'application:new-file'
   'ctrl-s': 'core:save'
   'ctrl-S': 'core:save-as'
-  'ctrl-w': 'core:close'
   'ctrl-f4': 'core:close'
+  'ctrl-w': 'core:close'
   'ctrl-z': 'core:undo'
   'ctrl-shift-z': 'core:redo'
   'ctrl-y': 'core:redo'