Put platform items back on .overlayer so they sort before package items

menus/darwin.cson

@@ -196,7 +196,7 @@
 ]
 
 'context-menu':
-  '.editor': [
+  '.overlayer': [
     {label: 'Undo', command: 'core:undo'}
     {label: 'Redo', command: 'core:redo'}
     {type: 'separator'}

menus/linux.cson

@@ -153,7 +153,7 @@
 ]
 
 'context-menu':
-  '.editor': [
+  '.overlayer': [
     {label: 'Undo', command: 'core:undo'}
     {label: 'Redo', command: 'core:redo'}
     {type: 'separator'}

menus/win32.cson

@@ -171,7 +171,7 @@
 ]
 
 'context-menu':
-  '.editor': [
+  '.overlayer': [
     {label: 'Undo', command: 'core:undo'}
     {label: 'Redo', command: 'core:redo'}
     {type: 'separator'}