comctl32[3/4]: rebar: don't assume the first band is visible (fixes bug #9450)

[Mikołaj Zalewski]

The code required that a row started with a visible band. However this 
was not met if the first band of the rebar was hidden. The new code 
should fix this case. I've also made it explicit in the comments that 
the functions require the first band to be visible and renamed 
next_band, prev_band to next_visible and prev_visible to make it clear 
what these functions do.
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