api/service-config: add 'pro' subdomain to tiktok (#1507)

Author: FiireWiinter

api/src/processing/service-config.js

@@ -152,7 +152,7 @@ export const services = {
             ":user/photo/:postId",
             "v/:postId.html"
         ],
-        subdomains: ["vt", "vm", "m", "t"],
+        subdomains: ["vt", "vm", "m", "t", "pro"],
     },
     tumblr: {
         patterns: [