Cleanup: remove unused 'eInsertKeyFlags' from delete API call

There is no need for an insertion flag in a delete function.

source/blender/python/intern/bpy_rna_anim.c

@@ -501,8 +501,7 @@ PyObject *pyrna_struct_keyframe_delete(BPy_StructRNA *self, PyObject *args, PyOb
 
     BKE_reports_init(&reports, RPT_STORE);
 
-    result = delete_keyframe(
-        G.main, &reports, (ID *)self->ptr.owner_id, NULL, path_full, index, cfra, 0);
+    result = delete_keyframe(G.main, &reports, self->ptr.owner_id, NULL, path_full, index, cfra);
     MEM_freeN((void *)path_full);
 
     if (BPy_reports_to_error(&reports, PyExc_RuntimeError, true) == -1) {