D25006: Make sure -dpi value is valid

[Filip Fila]

filipf accepted this revision.
filipf added a comment.


  Tested the patch and it no longer accepts strings or values under 24.
  
  Thanks @gcraciunescu
  
  This should be landed on the 5.17 branch, but let's wait and see if @davidedmundson has any additional comments.

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

REVISION DETAIL
  https://phabricator.kde.org/D25006

To: gcraciunescu, filipf, #plasma, ngraham, davidedmundson
Cc: davidedmundson, ngraham, plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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