Cleanup: BKE_library: remove 'test' param of id_copy.

This was used in *one* place only... much better to have a dedicated
helper for that kind of things. ;)

source/blender/modifiers/intern/MOD_datatransfer.c

@@ -182,8 +182,7 @@ static Mesh *applyModifier(ModifierData *md, const ModifierEvalContext *ctx, Mes
 		        LIB_ID_CREATE_NO_MAIN |
 		        LIB_ID_CREATE_NO_USER_REFCOUNT |
 		        LIB_ID_CREATE_NO_DEG_TAG |
-		        LIB_ID_COPY_NO_PREVIEW,
-		        false);
+		        LIB_ID_COPY_NO_PREVIEW);
 	}
 
 	BKE_reports_init(&reports, RPT_STORE);