Select current committer when editing changeset
Select current committer when editing changeset

When displaying the edit page, the committer is always set to '--'
instead of the changeset's current committer.

Regression introduced by ccb414a67ac72108a69e105977e11daf37402767.

Fixes #162

make-all/source-integration,dregad/source-integration,mantisbt-plugins/source-integration,make-all/source-integration,dregad/source-integration,make-all/source-integration,mantisbt-plugins/source-integration,dregad/source-integration,mantisbt-plugins/source-integration