Add missing xs:choice

[theseer]

Some xs:sequence nodes of the xsd need xs:choice to make the sort order become irrelevant as PHPUnit doesn't care and the config is perfectly valid either way.

Fixes #3248

[codecov-io]

Codecov Report

Merging #3250 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master   #3250   +/-   ##
========================================
  Coverage      82.3%   82.3%           
  Complexity     3486    3486           
========================================
  Files           140     140           
  Lines          9205    9205           
========================================
  Hits           7576    7576           
  Misses         1629    1629

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[sebastianbergmann]

Merged manually, thanks.