This fixes up go-gitea#10446;
in that, the *expected* timezone was changed to the local timezone,
but the computed timezone was left in UTC.

The result was this failure, when run on a non-UTC system:

	Diff:
    --- Expected
    +++ Actual
    @@ -5,3 +5,3 @@
       commitMsg: (string) (len=12) "init project",
    -  commitTime: (string) (len=29) "Wed, 14 Jun 2017 09:54:21 EDT"
    +  commitTime: (string) (len=29) "Wed, 14 Jun 2017 13:54:21 UTC"
      },
    @@ -11,3 +11,3 @@
       commitMsg: (string) (len=12) "init project",
    -  commitTime: (string) (len=29) "Wed, 14 Jun 2017 09:54:21 EDT"
    +  commitTime: (string) (len=29) "Wed, 14 Jun 2017 13:54:21 UTC"
      }
    Test:       	TestViewRepo2

I assume this was probably missed for the last couple months
since the CI servers all run in UTC?

The Format() string "Mon, 02 Jan 2006 15:04:05 UTC" was incorrect: 'UTC' isn't
recognized as a variable placeholder, but was just being copied verbatim. It
should use 'MST' in order to command Format() to output the attached timezone,
which is what `time.RFC1123` has.