[Qt] Fade out tap highlighting when starting to pan

[Qt] Fade out tap highlighting when starting to pan
https://bugs.webkit.org/show_bug.cgi?id=77202

Reviewed by Simon Hausmann.

Basically we need to fade out the potential tap highlighting
when ever the gesture recognition fails or another gesture
is recognized. We do that with this change.

* UIProcess/qt/QtTapGestureRecognizer.cpp:
(WebKit::QtTapGestureRecognizer::QtTapGestureRecognizer):
(WebKit::QtTapGestureRecognizer::recognize):
(WebKit::QtTapGestureRecognizer::reset):

    Remove reset as it does nothing but call code before the
    event handler is installed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@106116 268f45cc-cd09-0410-ab3c-d52691b4dbfc