Fix `Ui::scroll_with_delta` only scrolling if the `ScrollArea` is focused #11319

Job	Run time
cargo-deny aarch64-apple-darwin	39s
Check wasm32 + wasm-bindgen	2m 19s
cargo-deny aarch64-linux-android	40s
cargo-deny i686-pc-windows-gnu	38s
cargo-deny i686-pc-windows-msvc	41s
cargo-deny i686-unknown-linux-gnu	43s
android	21s
cargo-deny wasm32-unknown-unknown	41s
cargo-deny x86_64-apple-darwin	43s
Format + check + test	5m 37s
cargo-deny x86_64-pc-windows-gnu	38s
cargo-deny x86_64-pc-windows-msvc	39s
Check Windows	3m 24s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	38s
cargo-deny x86_64-unknown-redox	41s
	19m 41s

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