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/kt14243_2.kt

@@ -1,4 +1,3 @@
-// !API_VERSION: 1.3
 // !JVM_DEFAULT_MODE: enable
 // IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
@@ -25,4 +24,4 @@ class ZImpl3 : ZImpl2() {
 
 fun box(): String {
     return ZImpl3().test("OK")
-}
+}