Fix sharesheet permissioned icon loading bug

In some cases, returned ResolveInfo may not have a set icon but
it will always have an associated ActivityInfo. Fall back to
that ActivityInfo when no icon is set. Permissioned apps now
properly have their icon fetched.

Fixes: 129460747
Fixes: 125908050
Test: manual
Change-Id: I624b1d455106c987b1e3f6623ef9e69d22882e59