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

compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt2212.kt

@@ -1,7 +1,7 @@
 //KT-2212 Incomplete nullability information
 package kt2212
 
-fun main(args: Array<String>) {
+fun main() {
     val x: Int? = 1
     if (x == null) return
     System.out.println(<!DEBUG_INFO_SMARTCAST!>x<!>.plus(x<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>))