Don't instantiate uiShortcuts or its keybinding multiple times

modules/ui/init.js

@@ -418,7 +418,7 @@ export function uiInit(context) {
             }
 
             context.container()
-                .call(uiShortcuts(context));
+                .call(ui.shortcuts);
         }
 
         var osm = context.connection();
@@ -499,6 +499,8 @@ export function uiInit(context) {
 
     ui.photoviewer = uiPhotoviewer(context);
 
+    ui.shortcuts = uiShortcuts(context);
+
     ui.onResize = function(withPan) {
         var map = context.map();