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As per the attached bug, here is the logic for changing the header image

- The illustration should change when the user switches between "Save to device" and "Save to account".
- In the Update bubble, the illustration should change based on where the update will go.
- If the update will go to both locations, use the "account" image.

Screencast:
Light mode: https://screencast.googleplex.com/cast/NjQxNjYzNjU3MzY0Njg0OHw0NTg2MTgzYy1kMw
Dark mode: https://screencast.googleplex.com/cast/NTY4MTQ3NTYxMTUyNTEyMHwzOTI4Y2JkYy1mZQ

Bug: 1115936
Change-Id: Iaa3256fa1ff6dde3019da6a6da96940e577697b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421674
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809389}