KeyboardMapper: Without arguments, load current keymap

Author: https://github.com/BenWiederhake
Commit: d9e7e13fb2
Pull-request: https://github.com/SerenityOS/serenity/pull/5192
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/bcoles
Reviewed-by: https://github.com/emanuele6
Reviewed-by: https://github.com/linusg

Userland/Applications/KeyboardMapper/KeyboardMapperWidget.h

@@ -39,6 +39,7 @@ public:
 
     void create_frame();
     void load_from_file(const String);
+    void load_from_system();
     void save();
     void save_to_file(const StringView&);