TableCell: Use preset background colours
TableCell: Use preset background colours

Set whether we're using a backgroud based on whether the current
fill colour is not white, as opposed to whether a background colour
was set in that particular call's font style specification.

Signed-off-by: Julian Calaby <9bcd51e366259aea8c5172e58b2485b44ec61660@gmail.com>

SkUrRiEr/pdflib