Add compositor_free branch in Compatibility scene renderer free function

[clayjohn]

Fixes: #88861

See the equivalent code in the other renderers:

godot/servers/rendering/dummy/rasterizer_scene_dummy.h

Lines 171 to 173 in bb6b06c

	} else if (is_compositor(p_rid)) {
	compositor_free(p_rid);
	return true;

godot/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp

Lines 1199 to 1200 in bb6b06c

	} else if (is_compositor(p_rid)) {
	compositor_free(p_rid);

CC @BastiaanOlij

[BastiaanOlij]

Looks correct, you probably also need to add:

} else if (is_compositor_effect(p_rid)) {
	compositor_effect_free(p_rid);

It's a bit weird with these (including environment) as their implementation is in the base system but then the free logic is in each renderer.

[clayjohn]

@BastiaanOlij Done!

[BastiaanOlij]

lgtm

[akien-mga]

Thanks!