transceiver: Fix command build warning
transceiver: Fix command build warning

Place conditional brackets on handover table reset. Reset table
only on successful start or restart.

Change-Id: I74032b49785bd68835a0a68cb0f14cdaab4fcd26

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