libs: display: egl: remove unused header include
libs: display: egl: remove unused header include

The header gmodule.h is not used since the library dynamic loading for EGL
display was removed.

https://bugzilla.gnome.org/show_bug.cgi?id=772599

ceyusa/gstreamer-vaapi,ceyusa/gstreamer-vaapi,GStreamer/gstreamer-vaapi,GStreamer/gstreamer-vaapi