if a package has multiple branches, show the correct src.rpm for each branch

[tpokorra]

not sure how to do this.

see the problem here: https://lbs.solidcharity.com/package/tpokorra/openpetra/openpetranow-demo
all branches show the same src.rpm

Perhaps do something similar like the Windows Installer? that seems to work! https://lbs.solidcharity.com/package/tpokorra/openpetra/openpetranow-standalone