Update IS_PROD check (#2930)

* update is_prod check

* remove unused constants

* rename `IS_PROD` function to `IS_PROD_SERVICE`

src/lib/strings/url-helpers.ts

@@ -1,5 +1,5 @@
 import {AtUri} from '@atproto/api'
-import {PROD_SERVICE} from 'lib/constants'
+import {BSKY_SERVICE} from 'lib/constants'
 import TLDs from 'tlds'
 import psl from 'psl'
 
@@ -28,7 +28,7 @@ export function makeRecordUri(
 export function toNiceDomain(url: string): string {
   try {
     const urlp = new URL(url)
-    if (`https://${urlp.host}` === PROD_SERVICE) {
+    if (`https://${urlp.host}` === BSKY_SERVICE) {
       return 'Bluesky Social'
     }
     return urlp.host ? urlp.host : url