UX: Don't redirect to referer after login

It causes first login after verification to redirect to registration page,
which is weird, and the default Yesod falue is False, so, switching back to
False

src/Vervis/Foundation.hs

@@ -605,7 +605,7 @@ instance YesodAuth App where
     -- Where to send a user after logout
     logoutDest _ = HomeR
     -- Override the above two destinations when a Referer: header is present
-    redirectToReferer _ = True
+    redirectToReferer _ = False
 
     authenticate creds = liftHandler $ do
         let ident = credsIdent creds