Adapt CompileKotlinAgainstKotlin test to black box format

Rename/remove some obsolete test cases

compiler/testData/compileKotlinAgainstKotlin/defaultConstructor.kt

@@ -6,6 +6,7 @@ class A(val a: Int = 1)
 
 // FILE: B.kt
 
-fun main(args: Array<String>) {
+fun box(): String {
     aaa.A()
+    return "OK"
 }