Fixed SX127x FSK transmission when radio current operating mode is RX.

Observed while certifying a Class C device with Class A tests

Author: mluis1

src/radio/sx1272/sx1272.c

@@ -425,6 +425,8 @@ void SX1272SetRxConfig( RadioModems_t modem, uint32_t bandwidth,
 {
     SX1272SetModem( modem );
 
+    SX1272SetStby( );
+
     switch( modem )
     {
     case MODEM_FSK:
@@ -566,6 +568,8 @@ void SX1272SetTxConfig( RadioModems_t modem, int8_t power, uint32_t fdev,
 {
     SX1272SetModem( modem );
 
+    SX1272SetStby( );
+
     SX1272SetRfTxPower( power );
 
     switch( modem )

src/radio/sx1276/sx1276.c

@@ -476,6 +476,8 @@ void SX1276SetRxConfig( RadioModems_t modem, uint32_t bandwidth,
 {
     SX1276SetModem( modem );
 
+    SX1276SetStby( );
+
     switch( modem )
     {
     case MODEM_FSK:
@@ -644,6 +646,8 @@ void SX1276SetTxConfig( RadioModems_t modem, int8_t power, uint32_t fdev,
 {
     SX1276SetModem( modem );
 
+    SX1276SetStby( );
+
     SX1276SetRfTxPower( power );
 
     switch( modem )