White bar at the top while viewing full screen media in vertical mode

### Steps to reproduce

1. Set app theme to white
2. Open any media (photo or video) from any chat
3. Tap anywhere on photo or video to go full screen media
4. See annoying white bar at the top of the screen. It's a little less annoying if you run dark theme because then it's gray. It's only fine with black theme but I guess it's still there, just pitch black so not visible.

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### Outcome

I experience white bar which impacts the app experience in negative way, sure it's really minor and probably just an oversight but it's annoying once you're aware of it

I expect it to work in a way where medias are displayed with black color in the background if they don't fit the screen perfectly

### Your phone model

Huawei P40 but it likely doesn't matter as it happened on other devices I tested

### Operating system version

10 and 11

### Application version and app store

1.3.9 and 1.3.14, both from F-Droid

### Homeserver

matrix.org

### Will you send logs?

No