New J2K: correctly convert main method with varargs argument

#KT-33756 fixed

nj2k/testData/newJ2k/function/mainVararg.java

@@ -0,0 +1,4 @@
+public class Main {
+    public static void main(String... args) {
+    }
+}

nj2k/testData/newJ2k/function/mainVararg.kt

@@ -0,0 +1,5 @@
+object Main {
+    @JvmStatic
+    fun main(args: Array<String>) {
+    }
+}