debian/copyright: Update wrong paths in license list
debian/copyright: Update wrong paths in license list

Those paths were moved into a subdir a while ago, but this file was not
updated at the time.

Change-Id: I1857338b7a19e2a37f62386ceb4a1fad988272ba

osmocom/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx,osmocom/osmo-trx