disable activelyReceiving for sx1262 for now - it doesn't yet work

src/mesh/SX1262Interface.cpp

@@ -104,7 +104,9 @@ void SX1262Interface::startReceive()
 /** Could we send right now (i.e. either not actively receving or transmitting)? */
 bool SX1262Interface::isActivelyReceiving()
 {
-    return lora.getPacketLength() > 0;
+    return false; // FIXME
+    // FIXME this is not correct - often always true - need to add an extra conditional
+    // return lora.getPacketLength() > 0;
 }
 
 bool SX1262Interface::sleep()