func: drop support for switching to moonraker klipper branch (it's obsolete)

scripts/switch_branch.sh

@@ -20,13 +20,4 @@ switch_to_scurve_smoothing(){
     git remote add dmbutyugin $DMBUTYUGIN_REPO
   fi
   git fetch dmbutyugin -q && git checkout $BRANCH_SCURVE_SMOOTHING -q
-}
-
-switch_to_moonraker(){
-  cd $KLIPPER_DIR
-  status_msg "Switching...Please wait ..."; echo
-  if ! git remote | grep Arksine -q; then
-    git remote add Arksine $ARKSINE_REPO
-  fi
-  git fetch Arksine -q && git checkout $BRANCH_MOONRAKER -q
 }