TS2Swift tests: use non-Promise callable const fixture

Author: kateinoigakukun

Plugins/BridgeJS/Sources/TS2Swift/JavaScript/test/__snapshots__/ts2swift.test.js.snap

@@ -57,7 +57,10 @@ exports[`ts2swift > snapshots Swift output for CallableConst.d.ts > CallableCons
 
 @_spi(BridgeJS) import JavaScriptKit
 
-@JSFunction func fetch(_ url: String) throws(JSException) -> JSPromise
+@JSFunction func fetch(_ url: String) throws(JSException) -> Response
+
+@JSClass struct Response {
+}
 "
 `;
 

Plugins/BridgeJS/Sources/TS2Swift/JavaScript/test/fixtures/CallableConst.d.ts

@@ -1,2 +1,2 @@
 export interface Response {}
-export const fetch: (url: string) => Promise<Response>;
+export const fetch: (url: string) => Response;