Remove generated codegen tests, move all testData to box/

A single test file will be generated out of box/ directory

compiler/testData/codegen/box/defaultArguments/constructor/doubleDefArgs1InnerClass.kt

@@ -0,0 +1,14 @@
+class A {
+    inner class B(val a: Double = 1.0, val b: Int = 55, val c: String = "c")
+}
+
+fun box(): String {
+    val bDefault = A().B()
+    val b = A().B(2.0, 66, "cc")
+    if (bDefault.a == 1.0 && bDefault.b == 55 && bDefault.c == "c") {
+        if (b.a == 2.0 && b.b == 66 && b.c == "cc") {
+            return "OK"
+        }
+    }
+    return "fail"
+}