feature - change references for script_tools (#52)

* fix Line Follower Calibration GUI

* Fix path to line_sensor_gui in the desktop file

* feature - change references for script_tools

* use direct links instead of redirects

Install/update_sensors.sh

@@ -152,7 +152,7 @@ install_scriptools_and_rfrtools() {
 
   # if rfrtools is not bypassed then install it
   if [[ $install_rfrtools = "true" ]]; then
-    curl --silent -kL dexterindustries.com/update_rfrtools > $PIHOME/.tmp_rfrtools.sh
+    curl --silent -kL https://raw.githubusercontent.com/DexterInd/RFR_Tools/$selectedbranch/scripts/install_tools.sh > $PIHOME/.tmp_rfrtools.sh
     echo "Installing RFR_Tools. This might take a while.."
     bash $PIHOME/.tmp_rfrtools.sh ${rfrtools_options[@]} # > /dev/null
     ret_val=$?
@@ -165,7 +165,7 @@ install_scriptools_and_rfrtools() {
   fi
 
   # update script_tools first
-  curl --silent -kL https://raw.githubusercontent.com/DexterInd/script_tools/develop/install_script_tools.sh > $PIHOME/.tmp_script_tools.sh
+  curl --silent -kL https://raw.githubusercontent.com/DexterInd/script_tools/$selectedbranch/install_script_tools.sh > $PIHOME/.tmp_script_tools.sh
   echo "Installing script_tools. This might take a while.."
   bash $PIHOME/.tmp_script_tools.sh $selectedbranch > /dev/null
   ret_val=$?