runDialog: Add entry to focus chain

Currently the entry takes the intial key focus, but is not actually
part of the focus chain. Fix that, even though keynav does not work
too well for the dialog anyway, due to the entry consuming tab for
command completion.

https://bugzilla.gnome.org/show_bug.cgi?id=687127

js/ui/runDialog.js

@@ -206,7 +206,8 @@ const RunDialog = new Lang.Class({
 
         this.contentLayout.add(label, { y_align: St.Align.START });
 
-        let entry = new St.Entry({ style_class: 'run-dialog-entry' });
+        let entry = new St.Entry({ style_class: 'run-dialog-entry',
+                                   can_focus: true });
         ShellEntry.addContextMenu(entry);
 
         entry.label_actor = label;