Update AppImage to make it ready for Korean language.
It seems we have to add following 3 files in the AppImage that Korean language is full supported:
- libcomposeplatforminputcontextplugin.so
- libfcitxplatforminputcontextplugin.so
- libibusplatforminputcontextplugin.so
see here: https://bugs.kde.org/show_bug.cgi?id=405312 more details here: https://github.com/qTox/qTox/issues/5320