Improve how we show label colors in groups issue's page
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=18785) </details> <!--IssueSummary end--> When we filter the issues of a group by a label, we show the several colors of a label in the same square: ![Screen_Shot_2017-07-14_at_15.36.34](/uploads/e98d46d0941a2cafe2a0293b78e9f748/Screen_Shot_2017-07-14_at_15.36.34.png) ![Screen_Shot_2017-07-14_at_9.43.48_AM](/uploads/a9822866f1817514747c496d4bed892c/Screen_Shot_2017-07-14_at_9.43.48_AM.png) The reason is that the same label can have different colors between all the probjects. Recently both me and @ClemMakesApps though this was a bug :see_no_evil: /cc @sarrahvesselov
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