Objects: Remove Textured from object display type

As discussed with @billreynish this makes little sense now that we don't
have a dedicated textured mode. We don't have a superior texture or shaded
mode anymore and we also cannot mix different engines together (workbench
with eevee/lookdev).

The only feature it removes is the possibility to hide textures for certain
object in solid mode.

source/blender/blenkernel/intern/object.c

@@ -832,7 +832,7 @@ void BKE_object_init(Object *ob)
 	unit_m4(ob->constinv);
 	unit_m4(ob->parentinv);
 	unit_m4(ob->obmat);
-	ob->dt = OB_TEXTURE;
+	ob->dt = OB_SOLID;
 	ob->empty_drawtype = OB_PLAINAXES;
 	ob->empty_drawsize = 1.0;
 	ob->empty_image_depth = OB_EMPTY_IMAGE_DEPTH_DEFAULT;