modules/qt: use the compile_ui method inside the preprocess method
modules/qt: use the compile_ui method inside the preprocess method

for code deduplication

mesonbuild/meson,pexip/meson,pexip/meson,pexip/meson,jpakkane/meson,pexip/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,pexip/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,jpakkane/meson