use tab_colors instead of tab_sel_colors for ""

[Andreas Happe]

I'm not sure which one of the two was used in older ion-devel released,
but IMHO this feels better.
Andreas
diff -uNr io/ioncore/genframe.c io2/ioncore/genframe.c
--- io/ioncore/genframe.c       2003-03-11 23:38:23.000000000 +0100
+++ io2/ioncore/genframe.c      2003-03-12 00:53:06.000000000 +0100
@@ -776,7 +776,7 @@
                if(REGION_IS_ACTIVE(genframe))
                        COLORS=&(grdata->act_tab_sel_colors);
                else
-                       COLORS=&(grdata->tab_sel_colors);
+                       COLORS=&(grdata->tab_colors);
                draw_textbox(dinfo, "<empty frame>", CF_TAB_TEXT_ALIGN, TRUE);
                return;
        }