Do not increase verification check interval if first fails

Author: albireox

src/lvmnps/actor/actor.py

@@ -129,7 +129,6 @@ async def _check_internal(self):
             if result is False:
                 raise VerificationError("NPS verification failed.")
         except Exception as err:
-            self.check_interval = 5  # Speed up checks
             raise CheckError(str(err), error_code=NPSErrorCodes.VERIFICATION_FAILED)
 
         self.check_interval = CHECK_INTERVAL