Set packetUBXRXMPMPmessage callbackCopyValid to true

src/SparkFun_u-blox_GNSS_Arduino_Library.cpp

@@ -3310,6 +3310,8 @@ void SFE_UBLOX_GNSS::processUBXpacket(ubxPacket *msg)
 
         packetUBXRXMPMPmessage->callbackData->checksumA = msg->checksumA;
         packetUBXRXMPMPmessage->callbackData->checksumB = msg->checksumB;
+
+        packetUBXRXMPMPmessage->automaticFlags.flags.bits.callbackCopyValid = true; // Mark the data as valid
       }
     }
     else if (msg->id == UBX_RXM_SFRBX)