Gmail.py use hardcoded url variable 2/2

Because the call in the if and in the else blocks is the same, we can move it outside the conditional block.

Code now is clear.

offlineimap/repository/Gmail.py

@@ -57,11 +57,11 @@ class GmailRepository(IMAPRepository):
 
         url = super().getoauth2_request_url()
         if url is None:
-            # Nothing was configured, cache and return hardcoded one.
+            # Nothing was configured, use a hardcoded one.
             url = "https://accounts.google.com/o/oauth2/token"
+
         self.setoauth2_request_url(url)
-        else:
-            self.setoauth2_request_url(url)
+
         return self.oauth2_request_url
 
     def getport(self):