BugTrack/2367 Expand CSS variables in tDiary skin stylefile

Style selector : (Normal colors, Black theme colors)

* thead td.style_td (D0D8E0, 223333)
* thead th.style_th (E0E8F0, 332200)
* .style_table (CCD5DD, 999999) ($c_line1)
* .style_th (EEEEEE, 333333)
* .style_td (EEF5FF, 111111) ($c_background)
* span.noexists (FFFACC, 333355) ($c_dangling)
* div#preview (F5F8FF, 222200)
* .style_calendar (CCD5DD, 999999) ($c_line1)
* .style_td_caltop (EEF5FF, 111111) ($c_background)
* .style_td_today (FFFACC, 333355) ($c_dangling)
* .style_td_sat (DDE5FF, 223333) ($c_color2)
* .style_td_sun (FFEEEE, 332200) ($c_color3)
* .style_td_blank (EEF5FF, 111111) ($c_background)
* .style_td_day (EEF5FF, 111111) ($c_background)
* .style_td_week (DDE5EE, 333333) ($c_color1)
* hr.short_line (CCD5DD, 999999) ($c_line1)
* td.vote_labe (DDE5EE, 333333) ($c_color1)
* td.vote_td1 (FFEEEE, 332200) ($c_color3)
* td.vote_td2 (DDE5FF, 223333) ($c_color2)