D17859: Migrate from PreferenceActivity to PreferenceFragment because it has been deprecated since Android 3.0 API11

[Nicolas Fella]

nicolasfella accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R225 KDE Connect - Android application

BRANCH
  replace_preference_activity

REVISION DETAIL
  https://phabricator.kde.org/D17859

To: eduisters, #kde_connect, nicolasfella
Cc: kdeconnect, mschroeder, varunp, shivanshukantprasad, skymoore, brute4s99, wistak, anoopv, dvalencia, rmenezes, julioc, Leptopoda, timothyc, Danial0_0, johnq, Pitel, adeen-s, SemperPeritus, daniel.z.tg, jeanv, seebauer, bugzy, MayeulC, menasshock, mikesomov, tctara, apol
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