Fix an issue with the miner not switching away from an invalidated channel

inventory.py

@@ -298,7 +298,7 @@ class TimedDrop(BaseDrop):
         self._twitch.gui.inv.update_drop(self)
 
     def _update_real_minutes(self, delta: int) -> None:
-        if delta == 0 or self.real_current_minutes + delta < 0 or not self.can_earn():
+        if delta == 0 or self.real_current_minutes + delta < 0:
             return
         if self.real_current_minutes + delta < self.required_minutes:
             self.real_current_minutes += delta