Assign device of video type to video_device in UMP::GotOpenDevice

Fixed erroneous assignment from crrev.com/c/3575315

Bug: 1313021
Change-Id: I40eb79bb125b381f5abec976662eb4ec45dc446f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3629542


Reviewed-by: Tony Herre <toprice@chromium.org>
Commit-Queue: Tove Petersson <tovep@chromium.org>
Cr-Commit-Position: refs/heads/main@{#999898}