style(flagd): apply ruff format to selector_metadata expression

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>

Author: toddbaert

providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/grpc.py

@@ -74,9 +74,7 @@ def __init__(
         self.channel = self._generate_channel(config)
         self.stub = evaluation_pb2_grpc.ServiceStub(self.channel)
         self.selector_metadata: tuple[tuple[str, str], ...] | None = (
-            ((FLAGD_SELECTOR_HEADER, config.selector),)
-            if config.selector
-            else None
+            ((FLAGD_SELECTOR_HEADER, config.selector),) if config.selector else None
         )
 
         self.thread: threading.Thread | None = None