dashboard: remove obsolete SplitMakeRun exception

We solved the mentioned issue when we got cmd/release working.

Fixes golang/go#11812.

Change-Id: I163f6757c5e930629fb8b840701e9e3ce7edf3cf
Reviewed-on: https://go-review.googlesource.com/12754
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2 files changed