Fix spurious bullets in entity names in the "Add/remove entities" mod…

…al (#5341)

### What

Fix an oversight from:
- #5318

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crates/re_viewport/src/space_view_entity_picker.rs

@@ -90,7 +90,7 @@ fn add_entities_tree_ui(
         add_entities_line_ui(
             ctx,
             ui,
-            &format!("🔹 {name}"),
+            name,
             tree,
             space_view,
             query_result,