Simplify Wikitext_parser_sanitize_link_target
Simplify Wikitext_parser_sanitize_link_target

Commit 778839e made the wiki_append_sanitized_link_target function more
flexible by making it accept a str_t instead of a parser_t. This in turn
means that we can simplify the Wikitext_parser_sanitize_link_target
function; it can deal with a str_t directly rather than working with a
throwaway parser_t.

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

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