Remove quotes.

See eclipse-che/che#15293.

Signed-off-by: Masaki Muranaka <monaka@monami-ya.com>

build/scripts/cache_images.sh

@@ -27,7 +27,7 @@ images=$(yq -S -r '.icon' "${metas[@]}" | sort | uniq)
 mkdir -p "$RESOURCES_DIR" "$TEMP_DIR"
 
 echo "Caching images referenced in devfiles"
-for image in "${images[@]}"; do
+for image in ${images[@]}; do
   # Workaround for getting filenames through content-disposition: copy to temp
   # dir and read filename before moving to /resources.
   wget -P "${TEMP_DIR}" -nv --content-disposition "${image}"