Remove API_VERSION 1.3 from tests on JvmDefault

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

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmDefault/target8.kt

@@ -1,6 +1,6 @@
-// !API_VERSION: 1.3
 // !JVM_TARGET: 1.8
 // !JVM_DEFAULT_MODE: enable
+
 interface B {
 
     @JvmDefault
@@ -27,4 +27,4 @@ interface B {
     var prop4: String
         get() = ""
         set(<!UNUSED_PARAMETER!>value<!>) {}
-}
+}