hhctrl.ocx: Fix a double-click bug in the Contents tab introduced by the Index tab code.

[Erich Hoover]

Real Name:
    Erich Hoover
Description:
    The addition of handling the double-click event for the Index tab
ListView to the HTML Help widget introduced a bug in double-clicking
on items the Contents tab (since they are handled by the same
callback).  The attached patch corrects this issue.
Changelog:
    hhctrl.ocx: Fix a double-click bug in the Contents tab introduced
by the Index tab code.
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