Equal: show the bar of a Multiple pick at once, like the two-object flow

A fresh reference session shows the "=" bar of every object made equal
through Multiple right away; the earlier hidden state was not the rule.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

src/app/command_driver.rs

@@ -3437,12 +3437,10 @@ impl OpenCADStudio {
                         .scene
                         .parametric_constraint_set_mut(scope)
                         .add(ConstraintKind::Equal, vec![first, *follower], None);
-                    // A Multiple pick leaves its new bar unshown, as the
-                    // reference does; the single flow shows it at once.
                     self.tabs[i].scene.note_parametric_constraint_applied(
                         scope,
                         id,
-                        if multiple { 0 } else { self.constraint_bar_display },
+                        self.constraint_bar_display,
                     );
                 }
                 let changes = touched