Replace `widget.tabs[index]` with `tab` when using wrapped child

packages/flutter/lib/src/material/tabs.dart

diff --git a/packages/flutter/lib/src/material/tabs.dart b/packages/flutter/lib/src/material/tabs.dart
index 87a611a..11ed442 100644
--- a/packages/flutter/lib/src/material/tabs.dart
+++ b/packages/flutter/lib/src/material/tabs.dart
@@ -1983,7 +1983,7 @@
         heightFactor: 1.0,
         child: Padding(
           padding: _labelPaddings[index],
-          child: KeyedSubtree(key: _tabKeys[index], child: widget.tabs[index]),
+          child: KeyedSubtree(key: _tabKeys[index], child: tab),
         ),
       );
     });