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/compatibility/simpleFunction.kt

@@ -1,4 +1,3 @@
-// !API_VERSION: 1.3
 // !JVM_DEFAULT_MODE: compatibility
 // IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
@@ -32,4 +31,4 @@ fun box(): String {
     if (result != "OK") return "fail 1: ${result}"
 
     return Foo().test2()
-}
+}