Fix swinunetrv2 2D bug (#7302)

Fixes # .

### Description

A few sentences describing the changes proposed in this pull request.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: heyufan1995 <heyufan1995@gmail.com>

monai/networks/nets/swin_unetr.py

@@ -1024,7 +1024,7 @@ def __init__(
                 self.layers4.append(layer)
             if self.use_v2:
                 layerc = UnetrBasicBlock(
-                    spatial_dims=3,
+                    spatial_dims=spatial_dims,
                     in_channels=embed_dim * 2**i_layer,
                     out_channels=embed_dim * 2**i_layer,
                     kernel_size=3,