Fix \temporal typo (#224)

[cfr42]

Summary

Describe the change and why it is needed

Checklist

• Code follows the standard expl3 style including no lines longer
  than 79 chars
• There is a ChangeLog entry
• There is a linked issue (not needed for trivial PRs, e.g. fixing
  typos)
• l3build ctan passes

[cfr42]

something like

\int_new:N \l_@@_tmpa_int
\str_new:N \l_@@_tmpa_seq
\NewDocumentCommand \temporal { D <> { all } +m +m +m }
  {
    \@@_if_overlay:nTF {#1}
      {#3}
      {
        \int_if_exist:cF {g_@@_temporal_\tl_to_str:n {#1}_max_int}
          {
            \int_new:c {g_@@_temporal_\tl_to_str:n {#1}_max_int}
            \int_set:Nn \l_@@_tmpa_int {0}
            \clist_map_inline:Nn \l_@@_decode_overlays_clist 
              {
                \seq_set_split:Nnn \l_@@_tmpa_seq {-} {##1}
                \int_compare:nNnT 
                  {\seq_item:Nn \l_@@_tmpa_seq {-1}} > {\l_@@_tmpa_int}
                  {
                    \int_set_eq:NN \l_@@_tmpa_int 
                      {\seq_item:Nn \l_@@_tmpa_seq {-1}}
                  }
              }
              \int_gset_eq:cN 
                {g_@@_temporal_\tl_to_str:n {#1}_max_int} \l_@@_tmpa_int
          }
        \int_compare:vNnTF 
          {g_@@_temporal_\tl_to_str:n {#1}_max_int} < {\g_@@_slide_int}
          {
            #4
          } {
            \bool_if:NTF \g_@@_slide_continue_bool
              {#2}
              {
                #4
              }
          }
      }
  }

[josephwright]

I've fixed at the decode level, so closing here