Fixed ;walls command registration

Author: SIsilicon

src/server/commands/command_list.ts

@@ -64,7 +64,7 @@ import "./region/revolve.js";
 import "./region/rotate.js";
 import "./region/flip.js";
 import "./region/scale.js";
-import "./region/wall.js";
+import "./region/walls.js";
 import "./region/smooth.js";
 import "./region/faces.js";
 import "./region/hollow.js";