LibWeb: Remove unused member in LayoutNodeWithStyle, found by Coverity

Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/832b3256d30
Pull-request: https://github.com/SerenityOS/serenity/pull/3184
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/bugaevc

Libraries/LibWeb/Layout/LayoutNode.h

@@ -176,7 +176,6 @@ private:
 
     NonnullRefPtr<CSS::StyleProperties> m_specified_style;
     CSS::Position m_position;
-    CSS::TextAlign m_text_align;
 };
 
 class LayoutNodeWithStyleAndBoxModelMetrics : public LayoutNodeWithStyle {