If master was built, show GitLab.com

Evan Readrequested to merge
show-gitlab-com-for-master into master

Following up from !496 (merged).

Solves the problem where the menu item is now GitLab.com, but the version is still master.

Screen_Shot_2019-08-02_at_7.46.35_am

The menu item and version you to match as master. Now they match as GitLab.com.

Screen_Shot_2019-08-02_at_8.42.29_am

CC @gl-docsteam

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