D10951: Rename MaterialActivity to MainActivity

[Nicolas Fella]

nicolasfella removed dependencies: D10905: Apply coding style to whole project, D10948: Remove unused imports.

REPOSITORY
  R225 KDE Connect - Android application

REVISION DETAIL
  https://phabricator.kde.org/D10951

To: nicolasfella, #kde_connect, mtijink
Cc: mtijink, #kde_connect, vhyvert, adeen-s, SemperPeritus, ahmedbesbes, daniel.z.tg, jeanv, tfella, aboudhar, seebauer, bugzy, MayeulC, menasshock, ach, apol
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