Rename "rollback" param in _Wikitext_parser_append_sanitized_link_target
Rename "rollback" param in _Wikitext_parser_append_sanitized_link_target

This param name doesn't make much sense; perhaps it made sense
in the distant past, but it certainly doesn't now.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

geni/wikitext,wincent/wikitext,barnaclebarnes/wikitext,geni/wikitext,barnaclebarnes/wikitext,geni/wikitext,barnaclebarnes/wikitext,wincent/wikitext