fix(VanillinTerminal): GetCommands now puts built-ins before other co…

…mmands

AdvancedTerminalAPI/Vanillin/VanillinTerminal.cs

@@ -30,7 +30,7 @@ public class VanillinTerminal : ITerminal {
     public InputFieldDriver GetDriver() => _driver;
 
     public IEnumerable<ICommand> GetCommands(bool includeBuiltins) {
-        return includeBuiltins ? _commands.Concat(_builtinCommands) : _commands;
+        return includeBuiltins ? _builtinCommands.Concat(_commands) : _commands;
     }
 
     public void AddCommand(ICommand command) => AddCommand(_commands, command);