change function get_builder_status_icon to ASCII-Version

scripts/image-builder.sh

@@ -53,12 +53,12 @@ config_menu() {
 get_builder_status_icon() {
   if docker buildx ls 2>/dev/null | grep -q "multiarch-builder"; then
     if docker buildx ls | grep "multiarch-builder" | grep -q "running"; then
-      echo "🟢"
+      echo "[OK]"
     else
-      echo "🟡"
+      echo "[WARN]"
     fi
   else
-    echo "🔴"
+    echo "[ERR]"
   fi
 }