70-update_background_image: We now have rc mirror

Signed-off-by: Diego Giovane Pasqualin <dpasqualin@c3sl.ufpr.br>

scripts/70-update_background_image

@@ -46,12 +46,11 @@ HOST=$(echo $LEHOST | cut -d. -f1)
 
 case "$MIRROR" in
     "stable")
-        if test "$HOST" = "le"; then
         echo "Generating stable version, keeping background untouched."
         exit 0
-        else
+        ;;
+    "rc")
         RELEASE="Release Candidate"
-        fi
         ;;
     "testing")
         RELEASE="Beta"