debian/postinst: don't change /etc/osmocom

osmo_dia2gsup doesn't have a config file in /etc/osmocom. The path I put
there didn't make sense.

Fix for:
  chown: cannot access '/etc/osmocom/osmo_dia2gsup.service': No such file or directory

Fixes: 240b43f3 ("contrib/systemd: run as osmocom user")
Change-Id: I32a06db20c53fdc136989f41805c78e5d9420b9b

debian/postinst

@@ -16,10 +16,6 @@ case "$1" in
 		fi
 
 		# Fix permissions of previous (root-owned) install (OS#4107)
-		chown osmocom:osmocom /etc/osmocom/osmo_dia2gsup.service
-		chmod 0660 /etc/osmocom/osmo_dia2gsup.service
-		chown root:osmocom /etc/osmocom
-		chmod 2775 /etc/osmocom
 		mkdir -p /var/lib/osmo_dia2gsup
 		chown -R osmocom:osmocom /var/lib/osmo_dia2gsup
 		;;