Remove unused format string

Summary:
really just need a commit to buffer an open source version bump 0.0.51

Context:
pypi/warehouse#4985

Reviewed By: mrkmndz

Differential Revision: D22879537

fbshipit-source-id: 286a7275cda0658245700887a5eb686b9df4018e

Author: shannonzhu

client/recently_used_configurations.py

@@ -112,5 +112,5 @@ def _default_indicator(index: int) -> str:
         index = 0 if user_input == "" else int(user_input)
         return local_roots[index]
     except (Exception, KeyboardInterrupt):
-        LOG.error(f"No valid local root chosen. Quitting.")
+        LOG.error("No valid local root chosen. Quitting.")
         return None