upcoming-events: Use custom icons

Guido Güntherrequested to merge
guidog/phosh:upcoming-event-icons into main

We indicate empty vs non-empty rows rather than suggesting a sorting order.

/cc @gautham_x would be nice if you could have a quick look so we can get this in for 0.49

Closes: #1245 (closed) Signed-off-by: Guido Günther agx@sigxcpu.org

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