Do not resend focus on click

Do not set focused_id to XCB_NONE in route click to force resend focus,
in some cases to an already focused window.

Sending focus again on click is not necessary and may cause problems
with certain wine or mono apps. Resending focus makes combo boxes not
work in Office 2010.

This effectively reverts commit 250577da, so in case this commit causes
any problems with Eclipse to resurface, we’ll revert this commit in
favor of 250577da (the Eclipse-related bug fix).