backend/drm: "scaling mode" is a connector property

It's not a CRTC property. Remove it altogether since it's unused.

backend/drm/properties.c

@@ -35,7 +35,6 @@ static const struct prop_info crtc_info[] = {
 	{ "GAMMA_LUT_SIZE", INDEX(gamma_lut_size) },
 	{ "MODE_ID", INDEX(mode_id) },
 	{ "VRR_ENABLED", INDEX(vrr_enabled) },
-	{ "scaling mode", INDEX(scaling_mode) },
 #undef INDEX
 };
 

include/backend/drm/properties.h

@@ -28,7 +28,6 @@ union wlr_drm_connector_props {
 union wlr_drm_crtc_props {
 	struct {
 		// Neither of these are guaranteed to exist
-		uint32_t scaling_mode;
 		uint32_t vrr_enabled;
 		uint32_t gamma_lut;
 		uint32_t gamma_lut_size;