[NTG-context] Typo in strc-sec.mkiv

Hi Hans, \def\dopreventbreakafterheadauto % used after \c!before - {\ifconditonal\autoheadbreak + {\ifconditional\autoheadbreak \vspacing[\v!samepage-\currentheadlevel]% \fi} \def\dopreventbreakafterheadspec#1% see enumerations etc - {\ifconditonal\autoheadbreak + {\ifconditional\autoheadbreak \vspacing[\v!samepage-\the\numexpr\currentheadlevel+1\relax]% todo #1 \fi} Wolfgang