[3.10] Remove a redundant assignment in Tools/unittestgui/unittestgui.py (GH-21438) (GH-26171)

(cherry picked from commit a42d98ed91cd1f08b2e9734ca6ca136dd10dff5d)

Co-authored-by: Serhii Hidenko <shidenko97@gmail.com>
1 file changed