hhctrl.ocx: Find node attributes in a case-insensitive way

[Erich Hoover]

Real Name:
    Erich Hoover
Description:
    HTML help node attributes can appear in any case.  The attached
patch fixes displaying the "Contents" tab in ZEMAX, which has all of
its node attributes in upper case.
Changelog:
    hhctrl.ocx: Find node attributes in a case-insensitive way.
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