subscription_list [nfc]: Factor out helper for dividing line

Author: chrisbobbe

lib/widgets/subscription_list.dart

@@ -132,14 +132,15 @@ class _SubscriptionListHeader extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final line = Expanded(child: Divider(
+      color: const HSLColor.fromAHSL(0.2, 240, 0.1, 0.5).toColor()));
     return SliverToBoxAdapter(
       child: ColoredBox(
         color: Colors.white,
         child: Row(crossAxisAlignment: CrossAxisAlignment.center,
           children: [
             const SizedBox(width: 16),
-            Expanded(child: Divider(
-              color: const HSLColor.fromAHSL(0.2, 240, 0.1, 0.5).toColor())),
+            line,
             const SizedBox(width: 8),
             Padding(
               padding: const EdgeInsets.symmetric(vertical: 7),
@@ -152,8 +153,7 @@ class _SubscriptionListHeader extends StatelessWidget {
                   height: (16 / 14),
                 ))),
             const SizedBox(width: 8),
-            Expanded(child: Divider(
-              color: const HSLColor.fromAHSL(0.2, 240, 0.1, 0.5).toColor())),
+            line,
             const SizedBox(width: 16),
           ])));
   }