osmo-bsc.cfg: drop 'add' keyword from 'neighbor add'

Adjust for osmo-bsc change I143f21f6069d1a86096cc8240cf69eb7ea9c8ac8.

Change-Id: I6a83a8d4ba61b87905c6fae457d4b4eb6078dce9
diff --git a/bsc/osmo-bsc.cfg b/bsc/osmo-bsc.cfg
index 724d567..c7f34fc 100644
--- a/bsc/osmo-bsc.cfg
+++ b/bsc/osmo-bsc.cfg
@@ -89,7 +89,7 @@
   ip.access unit_id 1234 0
   oml ip.access stream_id 255 line 0
   # remote-BSS neighbor:
-  neighbor add lac 99 arfcn 123 bsic any
+  neighbor lac 99 arfcn 123 bsic any
   neighbor-list mode manual-si5
   neighbor-list add arfcn 100
   neighbor-list add arfcn 200