Update MenuFlags to work as expected

* 'popParent' has been removed
* 'noHistory' now works as expected
* Mods that explicitly want noHistory can state such in their constructor()

misc/menu_templates/message_base.in.hjson

@@ -776,7 +776,7 @@
                 key: confTag
                 pause: true
                 cls: true
-                menuFlags: [ "popParent", "noHistory" ]
+                menuFlags: [ "noHistory" ]
             }
         }
 
@@ -794,7 +794,7 @@
                 key: areaTag
                 pause: true
                 cls: true
-                menuFlags: [ "popParent", "noHistory" ]
+                menuFlags: [ "noHistory" ]
             }
         }
     }