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/privateDefaultFromDefaultImpl.kt

@@ -1,4 +1,3 @@
-// !API_VERSION: 1.3
 // !JVM_DEFAULT_MODE: enable
 // IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
@@ -24,4 +23,4 @@ class TestImpl: Test
 
 fun box(): String {
     return TestImpl().test()
-}
+}