donationmessage: massage icons
Reason for the change
Right now it has two hearts, which is a bit redundant and odd-looking. Let's replace the big one with a colorful version, and the small one with the KDE logo. This is more consistent with out donation iconography in other contexts, such as on kde.org.
Test plan
re-compile with SHOW_IN_MONTH
set to 11 in donationmessage.cpp
Screenshots or screen recordings
Bugs fixed
N/A
Edited by Nate Graham