EnvironmentSensorManager.cpp: Cleanup after failed RAK4631 GPS detection

If no GPS was detected, revert the hardware to the initial state,
otherwise we may see conflicts or increased power consumption on some
boards.

Signed-off-by: Frieder Schrempf <frieder@fris.de>

src/helpers/sensors/EnvironmentSensorManager.cpp

@@ -615,6 +615,7 @@ void EnvironmentSensorManager::rakGPSInit(){
     MESH_DEBUG_PRINTLN("No GPS found");
     gps_active = false;
     gps_detected = false;
+    Serial1.end();
     return;
   }
 
@@ -663,6 +664,8 @@ bool EnvironmentSensorManager::gpsIsAwake(uint8_t ioPin){
     gps_detected = true;
     return true;
   }
+
+  pinMode(ioPin, INPUT);
   MESH_DEBUG_PRINTLN("GPS did not init with this IO pin... try the next");
   return false;
 }