share/isso-dev.cfg: Use defaults for [markup] opts
Aligns with defaults in `isso/isso.cfg`.
@@ -31,7 +31,7 @@ profile = off
enabled = false
[markup]
-options = strikethrough, autolink, fenced-code, no-intra-emphasis
+options = autolink, fenced-code, no-intra-emphasis, strikethrough, superscript
flags =
allowed-elements =
allowed-attributes =
