fix is_disjoint_from with @final classes

Author: ibraheemdev

crates/ty_python_semantic/src/types/class.rs

@@ -627,14 +627,6 @@ impl<'db> ClassType<'db> {
             return true;
         }
 
-        // Optimisation: if either class is `@final`, we only need to do one `is_subclass_of` call.
-        if self.is_final(db) {
-            return self.is_subclass_of(db, other);
-        }
-        if other.is_final(db) {
-            return other.is_subclass_of(db, self);
-        }
-
         // Two disjoint bases can only coexist in an MRO if one is a subclass of the other.
         if self
             .nearest_disjoint_base(db)