fix the configuration issue for bicep serialization (#5387)

Author: ArcturusZhang

src/TypeSpec.Extension/Emitter.Csharp/src/emitter.ts

@@ -155,9 +155,9 @@ export async function $onEmit(context: EmitContext<AzureCSharpEmitterOptions>) {
                 outputFolder,
                 examplesDir
             );
-            configurations["enable-bicep-serialization"] =
-                options["enable-bicep-serialization"];
         }
+        configurations["enable-bicep-serialization"] =
+            options["enable-bicep-serialization"];
         /* TODO: when we support to emit decorator list https://github.com/Azure/autorest.csharp/issues/4887, we will update to use emitted decorator to identify if it is azure-arm */
         /* set azure-arm */