GUACAMOLE-232: Fall back to using recent keysym only after failing to determine released key by keycode.

guacamole-common-js/src/main/webapp/modules/Keyboard.js

@@ -386,8 +386,8 @@ Guacamole.Keyboard = function Keyboard(element) {
         this.location = location;
 
         // If key is known from keyCode or DOM3 alone, use that
-        this.keysym =  recentKeysym[keyCode]
-                    || keysym_from_keycode(keyCode, location)
+        this.keysym =  keysym_from_keycode(keyCode, location)
+                    || recentKeysym[keyCode]
                     || keysym_from_key_identifier(key, location); // keyCode is still more reliable for keyup when dead keys are in use
 
         // Keyup is as reliable as it will ever be