Allow tab reorder in Styles sidebar pane

Bug: 1146146
Change-Id: I4a36deaf0f1fcc6e54d956dc827121230eebf624
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3607831
Auto-Submit: Changhao Han <changhaohan@chromium.org>
Reviewed-by: Johan Bay <jobay@chromium.org>
Commit-Queue: Johan Bay <jobay@chromium.org>
diff --git a/front_end/panels/elements/ElementsPanel.ts b/front_end/panels/elements/ElementsPanel.ts
index 3a22b72..ea8863e 100644
--- a/front_end/panels/elements/ElementsPanel.ts
+++ b/front_end/panels/elements/ElementsPanel.ts
@@ -1029,7 +1029,7 @@
     };
 
     this.sidebarPaneView = UI.ViewManager.ViewManager.instance().createTabbedLocation(
-        () => UI.ViewManager.ViewManager.instance().showView('elements'));
+        () => UI.ViewManager.ViewManager.instance().showView('elements'), 'Styles-pane-sidebar', false, true);
     const tabbedPane = this.sidebarPaneView.tabbedPane();
     if (this.splitMode !== _splitMode.Vertical) {
       this.splitWidget.installResizer(tabbedPane.headerElement());