Fix error screen

[mozzius]

Error screen height collapsed due to some sort of flexbox issue. I would love to know the root cause, but changing flex_1 to w_full fixes it for now

Before	After

Test plan

• Get to the screen by finding a post with one repost, blocking that person, and then going back to the screen (or edit code to make the query return [])
• Check it now works on all platforms
• Confirm that the component still works in other places (i.e. gif select error). It might've changed some screens on native since it's now w_full instead of flex_1, but I can't find any examples

[github-actions]

Old size	New size	Diff
8.01 MB	8.01 MB	0 B (0.00%)

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