refactor(auth): drop dead fallback in scope space-split branch

The elif guard already requires `" " in claim_value.strip()`, which
guarantees at least two non-empty tokens survive the split+filter, so
`len(split_values) > 1` is always true. Collapses the ternary into a
single comprehension (per Greptile review).

Made-with: Cursor

litellm/proxy/auth/user_api_key_auth.py

@@ -168,9 +168,9 @@ def _routing_selector_matches_claim(
     ):
         # OAuth/OIDC often sends scope as a single space-delimited string. Only split
         # for the scope selector: iss/aud/client_id must stay exact full-string match
-        # on unverified claims (see routing override security review).
-        split_values = [v for v in claim_value.strip().split(" ") if v]
-        claim_list = split_values if len(split_values) > 1 else [claim_value]
+        # on unverified claims (see routing override security review). The elif guard
+        # (`" " in claim_value.strip()`) ensures at least two non-empty tokens survive.
+        claim_list = [v for v in claim_value.strip().split(" ") if v]
     else:
         claim_list = [str(claim_value)]