associative_erase_if: use type_dependent_false

Avoid a sizeof(X) == 0, which is IFNDR, in favor of the dedicated
feature (type_dependent_false).

Change-Id: I38441cfe3d5c18800bf61bcdd11268cb97d40ec6
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qcontainertools_impl.h

@@ -456,7 +456,7 @@ auto associative_erase_if(Container &c, Predicate &pred)
                 ++it;
             }
         } else {
-            static_assert(sizeof(Container) == 0, "Predicate has an incompatible signature");
+            static_assert(type_dependent_false<Container>(), "Predicate has an incompatible signature");
         }
     }