LP1816475: Change calendar_today icon to event icon
The locally served calendar_today icon doesn't look good in buttons
(like the date-select and datetime-select component buttons). But the
event icon looks very similar, and doesn't have the same negative
effects when placed in buttons.
Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu> Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>