H.264 importer: Fix detection of random accessible signaling for multi-slicing.
H.264 importer: Fix detection of random accessible signaling for multi-slicing.

Also cosmetics.

mstorsjo/l-smash,silverfilain/L-SMASH,mstorsjo/l-smash,maki-rxrz/L-SMASH,maki-rxrz/L-SMASH,l-smash/l-smash,silverfilain/L-SMASH,dwbuiten/l-smash,dwbuiten/l-smash,l-smash/l-smash,canbal/l-smash,silverfilain/L-SMASH,l-smash/l-smash,canbal/l-smash