Switch @JvmStatic diagnostic test to LanguageFeature usage

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmStatic/localFun_LL13.kt

@@ -0,0 +1,7 @@
+// !LANGUAGE: +JvmStaticInInterface
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+fun main(args: Array<String>) {
+    <!JVM_STATIC_NOT_IN_OBJECT_OR_COMPANION!>@JvmStatic fun a()<!>{
+
+    }
+}