Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/jvmOverloads/defaultsNotAtEnd.kt

@@ -0,0 +1,13 @@
+// WITH_RUNTIME
+
+class C {
+    @kotlin.jvm.JvmOverloads public fun foo(o: String = "O", i1: Int, k: String = "K", i2: Int): String {
+        return o + k
+    }
+}
+
+fun box(): String {
+    val c = C()
+    val m = c.javaClass.getMethod("foo", Int::class.java, Int::class.java)
+    return m.invoke(c, 1, 2) as String
+}