[BUG] orgalist: Hickup in fill-paragraph with orgalist in markdown-mode

[Daniel Hornung]

Hello,

when in markdown-mode, fill-paragraph behaves strangely in lists if the 
orgalist minor mode is enabled.

In the following example, when the cursor is in the first item of the list, 
pressing M-q or executing fill-paragraph does not recognize that line 3 is 
another list item:

- Nullam eu ante vel est convallis dignissim.  Fusce
  suscipit, wisi nec facilisis facilisis, est dui fermentum
  - Some text, indented

This will turn into the following (fill-column is set to 60 here):

- Nullam eu ante vel est convallis dignissim.  Fusce
  suscipit, wisi nec facilisis facilisis, est dui
  fermentum - Some text, indented

M-q works correctly in lists which orgalist does not recognize, for example if 
the list marker is an asterisk * not a dash -.

This is orgalist 1.2, markdown-mode 20200909.2355

In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
 of 2019-09-23, modified by Debian built on x86-grnet-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description:     Debian GNU/Linux 10 (buster)

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