[FIR] remove suspicious safe-cast to FirResolvedDeclarationStatus in status tranformer

Statuses of super members should already be preresolved

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirStatusResolver.kt

@@ -136,8 +136,8 @@ class FirStatusResolver(
                 }
                 ProcessorAction.NEXT
             }
-        }.mapNotNull {
+        }.map {
-            it.status as? FirResolvedDeclarationStatus
+            it.status as FirResolvedDeclarationStatus
         }
     }