alarm-clock-applet: fix build (#44872)
The build has been failing because sourceforge-served release include
-Werror=format=2 flag, which enabled -Werror=format-y2k, which in turn
stopped the build because of a debug log message formatting.
Building release from GitHub works fine.
authored by Alexey Shmalko and committed by xeji 6b1a04d7 12eb1e96