OML: fix broken curly braces while parsing SET BTS ATTR
OML: fix broken curly braces while parsing SET BTS ATTR

Looking at the problem, it's a surprise that the old code was working at
all...  (Thanks to jolly for pointing this out)

telenoobie/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,osmocom/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,telenoobie/osmo-bts