Tooltips: Fix TTM_TRACKACTIVATE and TTM_DELTOOL

[Robert Shearman]

Hi,

This patch fixes TTM_TRACKACTIVATE to not require a value in lParam if
it is being sent to deactivate a tooltip. It also improves
TOOLTIPS_DelTool{A,W} so that all of the common code has been moved into
TOOLTIPS_DelToolCommon. Code has also been added near the end of
TOOLTIPS_DelToolCommon so that all of the indices are updated properly.

Rob

Changelog:
- TTM_TRACKACTIVATE can have NULL lParam when deactivating
- Factor out common code from TOOLTIPS_DelTool{A,W}
- Update all indices correctly after delete

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