[Packaging] Fix syntax on temp old-sbuildrc file
[Packaging] Fix syntax on temp old-sbuildrc file

* mktemp will replace 'X' characters with random characters.

Change-Id: Ic8b9e05575b7687e4dd76ef79a3fc1a6c41125da

sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts,sillsdev/ci-builder-scripts