bug: Fix PatchMerging duplicate merging (#8285)

Fixes # .

### Description

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

### Types of changes
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).

Fixing issue #8284
In this format there are no duplicates:

```
t = [
    (0, 0, 0),
    (1, 0, 0),
    (0, 1, 0),
    (0, 0, 1),
    (1, 0, 1),
    (1, 1, 0),
    (0, 1, 1),
    (1, 1, 1),
    ]
print(set(t))
# {(1, 0, 1), (1, 1, 0), (0, 1, 0), (0, 0, 0), (1, 0, 0), (0, 0, 1), (1, 1, 1), (0, 1, 1)}
```

---------

Signed-off-by: pooya-mohammadi <[email protected]>

Author: pooya-mohammadi

monai/networks/nets/swin_unetr.py

@@ -782,9 +782,9 @@ def forward(self, x):
         x1 = x[:, 1::2, 0::2, 0::2, :]
         x2 = x[:, 0::2, 1::2, 0::2, :]
         x3 = x[:, 0::2, 0::2, 1::2, :]
-        x4 = x[:, 1::2, 0::2, 1::2, :]
-        x5 = x[:, 0::2, 1::2, 0::2, :]
-        x6 = x[:, 0::2, 0::2, 1::2, :]
+        x4 = x[:, 1::2, 1::2, 0::2, :]
+        x5 = x[:, 1::2, 0::2, 1::2, :]
+        x6 = x[:, 0::2, 1::2, 1::2, :]
         x7 = x[:, 1::2, 1::2, 1::2, :]
         x = torch.cat([x0, x1, x2, x3, x4, x5, x6, x7], -1)
         x = self.norm(x)