KT-6671 Report unused constructor parameters

#KT-6671 fixed

compiler/testData/diagnostics/tests/dataFlow/local/LocalClassDefaultParameters.kt

@@ -1,7 +1,7 @@
 fun test(x: Any) {
   if (x !is String) return
 
-  class Local(s: String = <!DEBUG_INFO_SMARTCAST!>x<!>) {
+  class Local(<!UNUSED_PARAMETER!>s<!>: String = <!DEBUG_INFO_SMARTCAST!>x<!>) {
     fun foo(s: String = <!DEBUG_INFO_SMARTCAST!>x<!>): String = s
   }
 }