Ignore $wgCapitalLinks setting for the property namespace

If $wgCapitalLinks = false [0] then annotations like [[has type:: ... ]] will
fail because of the inactive conversion rule has -> Has [1].

[0] https://www.mediawiki.org/wiki/Manual:$wgCapitalLinks
[1] https://www.semantic-mediawiki.org/wiki/Thread:Help_talk:Properties_and_types/Is_any_part_of_the_data_type_declaration_case-sensitive%3F