bug: Fix PatchMerging duplicate merging

[pooya-mohammadi]

Fixes # .

Description

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

Types of changes

• 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)}

[KumoLiu]

Thanks for the fix. LGTM.
Please sighoff to address the DCO issue. Thanks.
https://github.com/Project-MONAI/MONAI/pull/8285/checks?check_run_id=35266268085

[KumoLiu]

/build