fix: compile error

Author: jwxbond

webf/lib/src/rendering/flex.dart

@@ -1974,7 +1974,6 @@ class RenderFlexLayout extends RenderLayoutBox {
  alignSelf == AlignSelf.lastBaseline ||
  renderStyle.alignItems == AlignItems.baseline ||
  renderStyle.alignItems == AlignItems.lastBaseline;
- bool isHorizontal = _isHorizontalFlexDirection;
  if (isHorizontal && isBaselineAlign) {
  // Distance from top to baseline of child
  double childAscent = _getChildAscent(child);