user-search.txt: Move `label:Code-Review<=-1`
user-search.txt: Move `label:Code-Review<=-1`

Make this operator closer and next to the similar
`label:Code-Review>=1`.

Change-Id: I232f23749aab93937ff69b4ce8d3de2d38a77a3e

GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit