lower mem requirement for VARA

update

@@ -322,7 +322,7 @@ fi
 VARA_CHK=$(grep VARA ${BASE})
 if [ -n $VARA_CHK ]; then
 	FREEMEM=$(free -m | grep Mem: | awk '{ print $2 }')
-	if [ $FREEMEM -lt 1900 ]; then
+	if [ $FREEMEM -lt 1500 ]; then
 	echo "Not enough memory available"
 	yad --form --width=500 --text-align=center --center --title="Build-a-Pi" --text-align=center \
 	--image ${LOGO} --window-icon=${LOGO} --image-on-top --separator="|" --item-separator="|" \