For now, ls provider's score will be equal to the default one if ls
provider's documentSelector has pattern. For example, a ls registers
capability `textDocument/documentHighlight` with documentSelector
`{'language': 'cs', 'scheme': 'file', 'pattern': '**/*.cs'}`, it will
get score 5, which is equal to the default one with documentSelector
'*', even if the language id has matched. Since the capability is
registered later than the default one, DocumentHighlightManager will
only use the default one to provide highlight, which is not expected.

If all of language, scheme, and pattern match, we should return the
highest score of them, instead of the last score.

Signed-off-by: Adam Tao <tcx4c70@gmail.com>

Signed-off-by: Adam Tao <tcx4c70@gmail.com>