j2k: Adjust annotation converter to last changes

Only parameter named `value` can be marked vararg

j2k/testData/fileOrElement/annotations/annotationInterface4.kt

@@ -0,0 +1,13 @@
+annotation class Anon(public vararg val value: String, public val x: Int = 1)
+
+Anon("a", "b")
+trait I1
+
+Anon("c", "d", x = 1)
+trait I2
+
+Anon("c", "d", x = 1)
+trait I3
+
+Anon(value = *array("c", "d"))
+trait I4