bug: wzl: correct invocation of docker compose

[kfkitsune]

Docker changed to have docker compose as a plugin, and the command docker-compose no longer is default; a backwards-compatible check was created to allow older versions to still execute the script correctly (for the moment, at least).

Raised as an issue at: https://github.com/Weasyl/weasyl/pull/1372#issuecomment-1627634230

[codecov[bot]]

Codecov Report

Merging #1378 (cb42b1c) into main (e0328f3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1378   +/-   ##
=======================================
  Coverage   59.62%   59.62%           
=======================================
  Files          94       94           
  Lines        9068     9068           
  Branches     1635     1635           
=======================================
  Hits         5407     5407           
  Misses       3227     3227           
  Partials      434      434           

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