Revert upstream commit to fix erratic mouse scroll wheel behavior

Description:

Qt 6.7.3 introduced this quite breaking (and annoying) bug, which makes the behavior of scrolling with your mouse wheel quite unpredictable.

It seems like this bug only affects X11 sessions (but maybe it affects Wayland too, if you run a Qt app with -platform xcb?).

The bug has been reported upstream and its priority has been assigned to "high" by a member of the Qt team. A Gentoo developer also confirmed being affected by the bug.

There's no fix yet, but at least reverting the offending commit brings things back to what it was like in Qt 6.7.2.

Additional info:

• package version(s): 6.7.3-1
• config and/or log files: N/A
• link to upstream bug report, if any: https://bugreports.qt.io/browse/QTBUG-129509

Steps to reproduce:

The upstream bug report has steps to reproduce the issue.