test: Fix outdated page_data_add_line call in check_page_data

[jirutka]

check_page_data.c:18:5: error: too few arguments to function 'page_data_add_line'
   18 |     page_data_add_line(page_data, "aaa", true, true, true);
      |     ^~~~~~~~~~~~~~~~~~
In file included from check_page_data.c:4:
../src/page_data.h:58:6: note: declared here
   58 | void page_data_add_line(PageData * pageData, const gchar * label, const gchar * icon, const gchar * data, gboolean urgent, gboolean highlight, gboolean markup);
      |      ^~~~~~~~~~~~~~~~~~