Don't require BTC balance argument for topup notification

handler/ux/notify.py

@@ -51,9 +51,9 @@ class Notify(util.Base):
             priority="4",
         )
 
-    def notify_need_topup(self, amount_usd_xmr, amount_usd_btc):
+    def notify_need_topup(self, amount_usd_xmr):
         self.sendmsg(
-            f"XMR: {amount_usd_xmr} | BTC: {amount_usd_btc}",
+            f"XMR: {amount_usd_xmr}",
             title="Topup needed",
             tags="admin",
             priority="5",