my personal dwl config managed with pijul.

remove useless check of `m` in arrangelayers()

it is supossed to avoid a crash when we pass m=NULL as argument however it would crash anyway and also because we should not pass m=NULL

Created by  Leonardo Hernández Hernández  on September 18, 2022
QT36PXTVLHFVT54CDJN5JZTZQEIQZHHMSVZHG5IKGONCB3TRO6PQC
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