[autofit] Indicate tilde handling with a flag macro, too. * src/autofit/afadjust.h (AF_ADJUST_TILDE_TOP): New macro. (AF_AdjustmentDatabaseEntry): Remove field `apply_tilde`. * src/autofit/afadjust.c (adjustment_database, af_reverse_character_map_new), src/autofit/aflatin.c (af_glyph_hints_apply_vertical_separation_adjustments, af_latin_hints_apply): Updated.