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

compiler/testData/diagnostics/tests/j+k/sam/fakeOverrideFunctionForStaticSam.kt

@@ -14,7 +14,7 @@ public class Observable<T> {
 }
 
 // FILE: 1.kt
-fun main(args: Array<String>) {
+fun main() {
     BehaviorSubject.create<String>(null)
     BehaviorSubject.create<Int> { }
 }

compiler/testData/diagnostics/tests/j+k/sam/fakeOverrideFunctionForStaticSam.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 BehaviorSubject</*0*/ T : kotlin.Any!> : Observable<T!> {
     public constructor BehaviorSubject</*0*/ T : kotlin.Any!>()