Revert format change

Author: Porges

src/cli/onefuzz/backend.py

@@ -407,7 +407,7 @@ def request(
             except requests.exceptions.ReadTimeout as err:
                 LOGGER.info("request timed out: %s", err)
 
-            time.sleep(1.5 ** backoff)
+            time.sleep(1.5**backoff)
 
         if response is None:
             raise Exception("request failed: %s %s" % (method, url))