widclose: remove widget if Bangle.CLOCK is set after loading the widget

[rigrig]

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[gfwilliams]

Which clocks is this a problem for? Because I think really we just need to fix those clocks. There are a bunch of other widgets that rely on CLOCK being set at the start (like chrono, clock widget, etc) so we should really just try and fix the broken clocks rather than trying to work around this in each widget

[rigrig]

Well, clocks using ClockFace (oops), this PR fixes that, but I figured I would try and mitigate it on the widget side as well.

But you're right: we should just fix clocks, and this only hides the problem.