lms: Set Rx gain to midpoint, as comment suggests.

So far, the Rx gain was set to 34 dB, wile the comment stated it
would be set to half-point, which is 73/2=36dB.  Let's adjust the
code to match the comment.

Change-Id: Idc646def53b83faf4e6c011fb595fa436e223b32
diff --git a/Transceiver52M/device/lms/LMSDevice.cpp b/Transceiver52M/device/lms/LMSDevice.cpp
index 0a6c4a2..1cda4f9 100644
--- a/Transceiver52M/device/lms/LMSDevice.cpp
+++ b/Transceiver52M/device/lms/LMSDevice.cpp
@@ -223,7 +223,7 @@
 
 		// Set gains to midpoint
 		setTxGain((minTxGain() + maxTxGain()) / 2, i);
-		setRxGain(34.0, i);
+		setRxGain((minRxGain() + maxRxGain()) / 2, i);
 
 		m_lms_stream_rx[i] = {};
 		m_lms_stream_rx[i].isTx = false;