Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/box/callableReference/function/topLevelFromTopLevelStringNoArgs.kt

@@ -0,0 +1,6 @@
+fun foo() = "OK"
+
+fun box(): String {
+    val x = ::foo
+    return x()
+}