Fix blurry rasterized icons

Summary:
The vector icons were rastizered for older Android versions, but these were on the small side. This fixes the size.

BUG: 392061

Test Plan: The icons aren't blurry anymore on Android 4.2.

Reviewers: KDE Connect, nicolasfella

Reviewed By: KDE Connect, nicolasfella

Subscribers: KDE Connect

Differential Revision: https://phabricator.kde.org/D11644