bts/osmo-bts.cfg: use 'gsmtap-sapi enable-all'

Keep PDTCH/PTCCH disabled, it will blow up PCAPs otherwise.

Change-Id: Id1b523faf0d0ab6df00e46a40917c703b26d0e96
diff --git a/bts/osmo-bts.cfg b/bts/osmo-bts.cfg
index a92273f..0db4305 100644
--- a/bts/osmo-bts.cfg
+++ b/bts/osmo-bts.cfg
@@ -51,14 +51,9 @@
  rtp jitter-buffer 100
  paging queue-size 200
  paging lifetime 0
- gsmtap-sapi rach
- gsmtap-sapi agch
- gsmtap-sapi bcch
- gsmtap-sapi pch
- gsmtap-sapi sdcch
- gsmtap-sapi sacch
- gsmtap-sapi tch/f
- gsmtap-sapi tch/h
+ gsmtap-sapi enable-all
+ no gsmtap-sapi pdtch
+ no gsmtap-sapi ptcch
  min-qual-rach 50
  min-qual-norm -5
  !settsc