Fix function name typo when dying from unknown handler

src/imapdomo.skel

     Action="$1"; shift
     debug -v Action CfgDir LogDir HeaderDir Debug CdTo
     lshandlers | grep -qw "$Action" \
-     || dle "no handler for action: $Action.lua in $IMAPDOMO_HOME/handlers"
+     || die "no handler for action: $Action.lua in $IMAPDOMO_HOME/handlers"
     cmd=$(mkcmd)
     debug -v cmd
     bash -n <<<"$cmd" || bug "bad syntax of cmd: '$cmd'"