Blender Git Loki

Fix flag wrongly set in 'BM_face_split_edgenet_connect_islands'

Sometimes the `use_partial_connect` option could trigger the assert:
```
BLI_assert(!BM_elem_flag_test(l_iter->v, VERT_NOT_IN_STACK));
```

This can happen when `v_delimit->e` is not part of edgenet, so `v_other` will not have the flag.