Travis: Update for Moodle39

[justusdieckmann]

Fixed behattests, enforced moodle codestyle and removed duplicated code, so that travis now succeeds.
A new release is not needed.

[mwuttke]

@justusdieckmann 👍 Looks good.

Just one question:
Why did you choose xenial as the default distro in the travis.ci test?

Thanks for the good job & Greetings,
Michael

[justusdieckmann]

(Edited, because I think I first misunderstood your question)

In most of our other travis configs, we specified trusty as the distro. That didn't work anymore because of a problem with PHP 7.4 and php-gd and php-zip, so I updated all the configs to dist:xenial, which is also the default, if you don't specify a distro at all. But I thought it would be nice to specify xenial anyway, so that there wouldn't be random failures if travis decided to update the default and there were any compatibility problems with the next distro.

Thanks for the quick response,
Justus

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@c71b2a7). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #5   +/-   ##
=========================================
  Coverage          ?   59.50%           
  Complexity        ?      144           
=========================================
  Files             ?       11           
  Lines             ?      568           
  Branches          ?        0           
=========================================
  Hits              ?      338           
  Misses            ?      230           
  Partials          ?        0           

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