Ignore metakey in keyboard shortcuts

The F keyboard shortcut blocked access to search in Safari. Fix by
ignoring keyboard input when the metakey is pressed.
diff --git a/gddo-server/assets/site.js b/gddo-server/assets/site.js
index 0bb5fdd..7c91405 100644
--- a/gddo-server/assets/site.js
+++ b/gddo-server/assets/site.js
@@ -147,6 +147,10 @@
             return true;
         }
 
+        if (e.metaKey) {
+            return true;
+        }
+
         var ch = String.fromCharCode(e.which);
 
         if (combo) {