fix ExponentialWithJitterBackoff __eq__

This change fixes a typo in `ExponentialWithJitterBackoff`'s `__eq__` method.

Author: terencehonles

redis/backoff.py

@@ -170,7 +170,7 @@ def __hash__(self) -> int:
         return hash((self._base, self._cap))
 
     def __eq__(self, other) -> bool:
-        if not isinstance(other, EqualJitterBackoff):
+        if not isinstance(other, ExponentialWithJitterBackoff):
             return NotImplemented
 
         return self._base == other._base and self._cap == other._cap