Use quotes for all substitutions

Signed-off-by: Christian König <github@yubiuser.dev>

gravity.sh

@@ -743,7 +743,7 @@ gravity_DownloadBlocklistFromUrl() {
   fi
 
   if [[ "${download}" == true ]]; then
-    httpCode=$(curl --connect-timeout ${curl_connect_timeout} -s -L ${compression} ${cmd_ext} "${modifiedOptions[@]}" -w "%{http_code}" ${url} -o ${listCurlBuffer} 2>/dev/null)
+    httpCode=$(curl --connect-timeout ${curl_connect_timeout} -s -L "${compression}" "${cmd_ext}" "${modifiedOptions[@]}" -w "%{http_code}" "${url}" -o "${listCurlBuffer}" 2>/dev/null)
   fi
 
   case $url in