Moved AK Speaker Disable back to a title bar, and modified Mute Icon to differentiate (#1192)

* Added fn to indicate support for disabling speaker
* Support both mute & speaker disable icons
* Byte grouping for ui_config2_t bitmap
* Fix disabling AK speaker to take effect immediately

firmware/common/ak4951.hpp

@@ -837,6 +837,10 @@ class AK4951 : public audio::Codec {
     void speaker_enable();
     void speaker_disable();
 
+    bool speaker_disable_supported() const override {
+        return true;
+    }
+
     void set_headphone_volume(const volume_t volume) override;
     void headphone_mute();