x264: minor code improvements
- Fix for unnecessary reading of option values multiple times.
- Fix for an empty option label appearing in the drop list in prefs (for the default option - unset).
- Fix for stray newlines at end of option long descriptions, resulting in excess space at bottom of tooltips in prefs.
- Fix for missing translation and capitalisation of
--sout-x26X-bpyramid
values. - Fix for bad indentation.