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

compiler/testData/diagnostics/testsWithStdLib/varargs/kt4172j.kt

@@ -4,6 +4,6 @@ public class A {
 }
 
 // FILE: 1.kt
-fun main(args: Array<String>) {
+fun main() {
     A.main(arrayOf())
 }

compiler/testData/diagnostics/testsWithStdLib/varargs/kt4172j.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 A {
     public constructor A()