UI: Remove unused variable

[RytoEX]

Description

This variable was added in d18b38e (#6799), but it is not used. Let's remove it.

Motivation and Context

Want less warnings.

How Has This Been Tested?

I have not tested this, but I have visually inspected the code of this function and the variable is not used. If CI passes, that should be a sufficient test.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• Code cleanup (non-breaking change which makes code smaller or more readable)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.