Julien Jomier authored Apr 11, 2019 and Brad King committed Apr 11, 2019

Since commit 9175a378 (QtDialog: Add windows taskbar progress,
2018-11-17, v3.14.0-rc1~330^2) we've added a missing overlay icon.
This results in Windows falling back to a default overlay icon.
Simply drop this line.

Fixes: #19160