Add simple version of chooseOverload for common case of single non-generic signature (#17589)

* Add simple version of `chooseOverload` for common case of single non-generic signature

* Use a single function

tests/cases/compiler/contextualTypingFunctionReturningFunction.ts

@@ -0,0 +1,11 @@
+interface I {
+	a(s: string): void;
+	b(): (n: number) => void;
+}
+
+declare function f(i: I): void;
+
+f({
+	a: s => {},
+	b: () => n => {},
+});