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

compiler/testData/diagnostics/tests/overload/kt2493.kt

@@ -13,7 +13,7 @@ class BImpl: B
 
 class C: A, B
 
-fun main(args: Array<String>) {
+fun main() {
     AImpl().f()
     BImpl().f()
     C().<!NI;OVERLOAD_RESOLUTION_AMBIGUITY, OI;CANNOT_COMPLETE_RESOLVE!>f<!>()

compiler/testData/diagnostics/tests/overload/kt2493.txt

@@ -1,6 +1,6 @@
 package
 
-public fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
+public fun main(): kotlin.Unit
 public fun </*0*/ R : A> R.f(): kotlin.Unit
 public fun </*0*/ R : B> R.f(): kotlin.Unit