Showing tag instead of branch name with EnableFileStatus disabled

[Thomas G. Mayfield]

Notes:
- Using posh-get installed using psget today
- The build server tags git with versions, so most revisions on master
have a build version tag
- I have $global:GitPromptSettings.EnableFileStatus disabled because
it's too slow to check
- With $global:GitPromptSettings.EnableFileStatus set to false, I get
the tag name instead of the branch in my prompt:

C:\Data\Code\Scheck\ScheckTrac.NET.local [(1.8.96.0)]> git checkout
master
Already on 'master'
C:\Data\Code\Scheck\ScheckTrac.NET.local [(1.8.96.0)]> $GitStatus
Branch : (1.8.96.0)
Working : {}
Index : {}
BehindBy : 0
HasUntracked : False
HasWorking : False
AheadBy : 0
GitDir : C:\Data\Code\Scheck\ScheckTrac.NET.local\.git
HasIndex : False

C:\Data\Code\Scheck\ScheckTrac.NET.local [(1.8.96.0)]>
$global:GitPromptSettings.EnableFileStatus = $true
C:\Data\Code\Scheck\ScheckTrac.NET.local [master]>