Report UNUSED_PARAMETER on main parameter in 1.3+ #KT-26999 Fixed

compiler/testData/diagnostics/tests/varargs/kt1835.kt

@@ -5,7 +5,7 @@ public class JavaClass {
 }
 
 // FILE: kotlin.kt
-fun main(args : Array<String>) {
+fun main() {
     JavaClass().from()
     JavaClass().from("")
     JavaClass().from("", "")

compiler/testData/diagnostics/tests/varargs/kt1835.txt

@@ -1,6 +1,6 @@
 package
 
-public fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
+public fun main(): kotlin.Unit
 
 public open class JavaClass {
     public constructor JavaClass()