fix(theater): 减小剧场搜索框圆角

test/discover/home_all_dramas_grid_test.dart

@@ -257,7 +257,7 @@ void main() {
                 .decoration!
             as BoxDecoration;
 
-    expect(shell().borderRadius, BorderRadius.circular(22));
+    expect(shell().borderRadius, BorderRadius.circular(12));
     expect(shell().color, AppColors.card);
     expect((shell().border! as Border).top.color, Colors.transparent);
     expect(