M17: always open squelch on tramsissions with destination set to INFO or ECHO

Fix #229

openrtx/src/rtx/OpMode_M17.cpp

@@ -356,7 +356,7 @@ void OpMode_M17::txState(rtxStatus_t *const status)
 bool OpMode_M17::compareCallsigns(const std::string& localCs,
                                   const std::string& incomingCs)
 {
-    if(incomingCs == "ALL")
+    if((incomingCs == "ALL") || (incomingCs == "INFO") || (incomingCs == "ECHO"))
         return true;
 
     std::string truncatedLocal(localCs);