fix: dashboard theme import order (#8920)

Author: sissbruecker

packages/dashboard/theme/lumo/vaadin-dashboard.js

@@ -1,4 +1,4 @@
-import './vaadin-dashboard-widget.js';
 import './vaadin-dashboard-section.js';
+import './vaadin-dashboard-widget.js';
 import './vaadin-dashboard-styles.js';
 import '../../src/vaadin-dashboard.js';

packages/dashboard/theme/material/vaadin-dashboard.js

@@ -1,3 +1,3 @@
-import './vaadin-dashboard-widget.js';
 import './vaadin-dashboard-section.js';
+import './vaadin-dashboard-widget.js';
 import '../../src/vaadin-dashboard.js';