Update timer example to delete timer properly.
Update timer example to delete timer properly.

DragonMinded/libdragon,sp1187/libdragon,kmather73/libdragon,kmather73/libdragon,sp1187/libdragon,sp1187/libdragon,DragonMinded/libdragon,DragonMinded/libdragon,conker64/libdragon,conker64/libdragon