load_indication: Fix missing re-set of RACH parameters
load_indication: Fix missing re-set of RACH parameters

While we re-set the PCH load counters after every report, we never
actually re-set the RACH load counters.  This meant that the
period/window for RACH load averaging would always grow, rather than
being reset every load indication period.

Related: OS#3750
Change-Id: Icd9150ba56d77d031c3cf496c5936c2de52b364c

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts