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js: Move global keyboard handler to capturing phase

In the bubbling phase it managed to catch the "Enter" keypress that
opened a dialogue box from the menu and use it to close the dialogue
box again.  I think it's probably reasonable to have it run earlier and
just permanently steal any keypresses it wants.

--- a/emccpre.js

+++ b/emccpre.js

@@ -519,11 +519,16 @@

             for (var i in dlg_return_funcs)

                 dlg_return_funcs[i]();

             command(3);

+            event.preventDefault();

+            event.stopPropagation();

         }

-        if (dlg_dimmer !== null && event.keyCode == 27)

+        if (dlg_dimmer !== null && event.keyCode == 27) {

             command(4);

-    });

+            event.preventDefault();

+            event.stopPropagation();

+        }

+    }, true);

     // Event handler to fake :focus-within on browsers too old for

     // it (like KaiOS 2.5).  Browsers without :focus-within are also