added PortProton user-agent for get WINE metadata

data_from_portwine/scripts/functions_helper

@@ -5368,7 +5368,7 @@ gui_proton_downloader () {
     fi
 
     METADATA_URL="https://git.linux-gaming.ru/Boria138/PortProton-Wine-Metadata/raw/branch/main/wine_metadata.json"
-    METADATA=$(curl -s "$METADATA_URL")
+    METADATA=$(curl  -A 'PortProton' -s "$METADATA_URL")
     if [[ -z "$METADATA" ]] ; then
         yad_error "${translations[Error: failed to fetch metadata.]}"
         restart_pp