Main: Be a little more resilient againts .well-known delegation not resolving

src/main.rs

@@ -84,7 +84,10 @@ async fn process_media(source: MediaSource, body: Option<String>, server: Option
 
     let client = match server {
         Some(ref url) => Client::builder().server_name_or_homeserver_url(url),
-        None => Client::builder().server_name(server_name),
+        // NOTE: We know that server_name is not a URL at this point, however if resolving .well-known
+        //       delegation fails falling back to interpreting the server name as the base URL is somewhat
+        //       more resilient. Just had this now.
+        None => Client::builder().server_name_or_homeserver_url(server_name),
     }.build().await?;
 
     debug!("Downloading {} from {}", uri, client.homeserver());