qt module: move comment to the correct location after refactoring
qt module: move comment to the correct location after refactoring

In commit f291b637b13ba32e20d1081906e68780d2a5ae5a the tools were moved
around but a comment got forgotten. Now, in order to be meaningful and
remind us of anything, it needs to be in a different location.

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