Updated Field test results (markdown)

Field-test-results.md

@@ -1,4 +1,4 @@
-![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/images/setup.png)
+![alt text](https://raw.githubusercontent.com/sh123/esp32_loraprs/master/extras/images/setup.png)
 - Antennas
   - Client: rubber duck, halo, mobile antenna on a car roof
   - Server: 7 element UHF yagi indoors, vertical on the roof