Remove API_VERSION 1.3 from tests on JvmDefault

So that these tests will now check behavior on the latest API version

compiler/testData/codegen/box/jvm8/defaults/defaultArgs.kt

@@ -1,9 +1,9 @@
-// !API_VERSION: 1.3
 // !JVM_DEFAULT_MODE: enable
 // IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
 // JVM_TARGET: 1.8
 // WITH_RUNTIME
+
 interface Z {
     @JvmDefault
     fun test(s: String = "OK"): String {
@@ -15,4 +15,4 @@ class Test: Z
 
 fun box(): String {
     return Test().test()
-}
+}