tms9928a: Rename render_mode2_pattern to render_pattern
tms9928a: Rename render_mode2_pattern to render_pattern

This function is used in both mode0 and mode2

JoppyFurr/Snepulator,JoppyFurr/Snepulator,JoppyFurr/Snepulator,JoppyFurr/Snepulator,JoppyFurr/Snepulator,JoppyFurr/Snepulator