Allow tables to be detected properly when inside of obsidian callouts

[JU12000]

Simply adds the > to the leftMarginChars by default. This allows md-advance-tables to detect tables inside of Obsidian callouts. Formatting of these kinds of tables is still broken and will need to be fixed in the upstream @tgrosinger/md-advance-tables repo.

Tested in a vault with non-trivial (~50 files with callout-enclosed tables) usage and noticed no adverse affects.

Please advise if any additional work or testing is required, thanks for your consideration.

[JU12000]

Just realized as I was digging into it more that the tables do actually format properly. I had believed that they weren't because Obsidian doesn't use monospace font for tables when enclosed in a callout.

That will need to be a fix at the obsidian level, which means this is actually functioning as intended.

[HoCoK31]

With monospaced font works great, would be nice to see as an optional in settings