Make bench script compatible with neovim

Author: chr4

tests/bench

@@ -2,5 +2,5 @@
 set -e
 s=startuptime.txt
 vim --startuptime $s -o -c qa "$@"
-perl -lane'$sum += $F[1] if m!/\.vim/after/syntax/css\.vim$!; END {print $sum}' $s
+perl -lane'$sum += $F[1] if m!/after/syntax/css\.vim$!; END {print $sum}' $s
 rm $s