Call workspaceEvent and updateX11Time only once per event
Summary:
On Wayland processXcbEvents calls workspaceEvents and updateX11Time but this
is already done in the native event filter.
Test Plan:
Manual test shows Xwayland still works and constant calls to
XcbEventFilter::nativeEventFilter are processed.
Reviewers: KWin, davidedmundson
Reviewed By: KWin, davidedmundson
Subscribers: davidedmundson, kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D14215