Xiaomi Vacuum: keep error state active after erroring (#16562)

* Check for got_error to keep consistent error reporting

* reword a comment

homeassistant/components/vacuum/xiaomi_miio.py

@@ -179,6 +179,10 @@ class MiroboVacuum(StateVacuumDevice):
     def state(self):
         """Return the status of the vacuum cleaner."""
         if self.vacuum_state is not None:
+            # The vacuum reverts back to an idle state after erroring out.
+            # We want to keep returning an error until it has been cleared.
+            if self.vacuum_state.got_error:
+                return STATE_ERROR
             try:
                 return STATE_CODE_TO_STATE[int(self.vacuum_state.state_code)]
             except KeyError: