PCU: remove deprecated 'alpha 0' from osmo-pcu.cfg

Change-Id: I38d2d141a0743cc4bb61f62a98d7cc5c1384cff5
diff --git a/pcu/osmo-pcu.cfg b/pcu/osmo-pcu.cfg
index 2c2d692..31f8cda 100644
--- a/pcu/osmo-pcu.cfg
+++ b/pcu/osmo-pcu.cfg
@@ -29,7 +29,6 @@
  flow-control-interval 10
  cs 2
  alloc-algorithm dynamic
- alpha 0
  gamma 0
  pcu-socket /tmp/pcu_bts
  neighbor resolution 127.0.0.1