search: lucky search does not unquote aliased patterns

Created by: rvantonder

The unquote rule would fire for content:"xyz" syntax since xyz is quoted. It's true that the pattern is quoted (as opposed to content:xyz), but lucky search isn't meant to try unquote that syntax, because the quotes on patterns on fields like content are never searched literally. This updates the unquote rule to only apply to quoted patterns that do not have content: in front of them (i.e., not aliased).

Test plan

Adds test.