fix for mode WX_FIXED, when triggered once TX was always active - variable "nextTX" was always == 0 - now setting to value of "max_time_to_nextTX" - works

src/TTGO_T-Beam_LoRa_APRS.ino

@@ -478,6 +478,7 @@ void loop() {
   } else {
     LatShown = LatFixed;
     LongShown = LongFixed;
+    nextTX = max_time_to_nextTX;
   }
 
   batt_read();