Avatars are shown in light mode in smart picker

[SystemKeeper]

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Steps to reproduce

1. Open smart picker
2. Select talk conversations
3. Search for a conversation

Expected behaviour

The shown avatar should respect the current dark/light mode setting

Actual behaviour

Talk app

Talk app version: 17.0.1 on c.nc.c

[nickvergessen]

Upstream issue, but we can keep this item for tracking:
nextcloud/server#37272