Fix navigation for emby-select element

Regression 84563176a1
If we prevent default action, keyboard navigation won't work.

src/elements/emby-select/emby-select.js

@@ -79,24 +79,10 @@ function onMouseDown(e) {
 }
 
 function onKeyDown(e) {
-    switch (e.keyCode) {
+    if (e.keyCode === 13 && !enableNativeMenu()) {
-        case 13:
-            if (!enableNativeMenu()) {
         e.preventDefault();
         showActionSheet(this);
     }
-            return;
-        case 37:
-        case 38:
-        case 39:
-        case 40:
-            if (layoutManager.tv) {
-                e.preventDefault();
-            }
-            return;
-        default:
-            break;
-    }
 }
 
 let inputId = 0;