LibWeb: Move rows heights calculation in separate function in TFC

Author: https://github.com/kalenikaliaksandr
Commit: 7d2a72d748
Pull-request: https://github.com/SerenityOS/serenity/pull/16899
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/Layout/TableFormattingContext.h

@@ -25,6 +25,7 @@ private:
     void compute_table_width();
     void distribute_width_to_columns();
     void determine_intrisic_size_of_table_container(AvailableSpace const& available_space);
+    void calculate_row_heights();
 
     CSSPixels m_automatic_content_height { 0 };