SP-46: Rule-Based MatchMaker inconsistency on Windows' HighContrast setting

See JIRA: http://issues.gpii.net/browse/SP-46

s/highContrastOn/HighContrastOn/ to match with the Windows setting
Merge pull request #18 from javihernandez/SP-46

SP-46: Rule-Based MatchMaker inconsistency on Windows' HighContrast sett...