X11: Attach translations also to menuform

Without this, the keyboard commands don't work in the extended
command window on Linux. If the translations are removed from
menuformview, then the keyboard commands don't work on Mac.

Having the translations in both doesn't seem to hurt.

win/X11/winmisc.c

@@ -953,6 +953,8 @@ Widget *formp; /* return */
                                  args, num_args);
 
     num_args = 0;
+    XtSetArg(args[num_args], XtNtranslations,
+             XtParseTranslationTable(popup_translations)); num_args++;
     *formp = form = XtCreateManagedWidget("menuform", formWidgetClass, view,
                                           args, num_args);