Bug fix : display correct category row

[keetiz]

When looking for which category row to display, take all rows into account, not only visible rows

[keetiz]

Hi team, this is the fix for the bug described in this forum thread

https://forums.coronalabs.com/topic/68339-categories-rows-on-tableview-doesnt-display-the-right-one/

I also included a small check on setFillColor as this error appeared for us rarely

Best regards,
Pascal Bancel
Keetiz CTO

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