Call vectorSlicer() right before packing bits for transmission to osmo-bts.

vectorSlicer() converts soft-bits from -1..+1 to 0..1 while we want
to keep SoftVector in -1..+1 mode until the last minute, because at some
point we'll want to transmit -1..+1 to osmo-bts instead of converting it
from 0..1 back to -1..+1 on the osmo-bts side.

Plus it removes code duplication - we call it once instead of twice.

Change-Id: Idd6ddd7ac219afb0df055a692632678b66373764
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index 3f624d0..85dd629 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -962,6 +962,9 @@
   if (!rxBurst)
     return;
 
+  // Convert -1..+1 soft bits to 0..1 soft bits
+  vectorSlicer(rxBurst);
+
   /*
    * EDGE demodulator returns 444 (148 * 3) bits
    */