cea708decoder: use correct mask for font style
First three bits are used for font style, so mask should be 0111 rather than 011 (in binary)
See SetPenAttributes section in https://en.wikipedia.org/wiki/CEA-708
Edited by Aaron Boxer
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First three bits are used for font style, so mask should be 0111 rather than 011 (in binary)
See SetPenAttributes section in https://en.wikipedia.org/wiki/CEA-708