html: case sensitive file systems require matching require args.
html: case sensitive file systems require matching require args.

* ldoc/html.lua: Make sure to `require 'pl.OrderedMap'` (with a
capital 'O') to match the filename installed by penlight.

Signed-off-by: Gary V. Vaughan <f9023000f29773649f3850298becb9544b5fd6a9@gnu.org>

msva/LDoc,henry4k/LDoc,stevedonovan/LDoc,cjtallman/LDoc