Add PiSDR Desktop Link.

builder/stage4/04-pisdr-system/02-run.sh

@@ -1,7 +1,9 @@
 #!/bin/bash -e
 
 on_chroot << EOF
-mkdir -p 	"/home/${FIRST_USER_NAME}/PiSDR"
-mkdir -p 	"/home/${FIRST_USER_NAME}/PiSDR/Software"
-mkdir -p 	"/home/${FIRST_USER_NAME}/PiSDR/Radios"
+mkdir -p "/home/${FIRST_USER_NAME}/PiSDR"
+ln -sf "/home/${FIRST_USER_NAME}/PiSDR" PiSDR
+
+mkdir -p "/home/${FIRST_USER_NAME}/PiSDR/Software"
+mkdir -p "/home/${FIRST_USER_NAME}/PiSDR/Radios"
 EOF