fix: Remove superfluous response write

pkg/spamasaurusrex/main.go

@@ -56,7 +56,7 @@ func callbackHandler(w http.ResponseWriter, r *http.Request) {
 	session.Values["token"] = token
 	session.Save(r, w)
 
-	w.Write([]byte("Authentication successful!"))
+	// w.Write([]byte("Authentication successful!"))
 
 	url := "https://alias.spamasaurus.com"
 	http.Redirect(w, r, url, http.StatusAccepted)