wayland: Fix wayland display handle request message

Pavel Shramov requested to merge shramov/gstreamer:fix-wldisplay into main

See #2583

Some time ago wayland rework landed (pull !2479 (merged), commit 8c3e33d4) that changed display handle request message from GstWaylandDisplayHandleContextType to GstWlDisplayHandleContextType.

But not all places used gst/wayland/wayland.h header, in subprojects/gst-plugins-base/gst-libs/gst/gl/gstglutils.c string is hardcoded (probably to break good -> bad header dependency).

Edited by Pavel Shramov

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