Fix default height of top/bottom panels #12049

Job	Run time
Format + check + test	5m 47s
Check wasm32 + wasm-bindgen	2m 45s
android	28s
cargo-deny aarch64-apple-darwin	41s
cargo-deny aarch64-linux-android	38s
Check Windows	2m 45s
cargo-deny i686-pc-windows-gnu	38s
cargo-deny i686-pc-windows-msvc	43s
cargo-deny i686-unknown-linux-gnu	39s
cargo-deny wasm32-unknown-unknown	37s
cargo-deny x86_64-apple-darwin	36s
cargo-deny x86_64-pc-windows-gnu	41s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	38s
cargo-deny x86_64-unknown-linux-musl	37s
cargo-deny x86_64-unknown-redox	38s
	19m 29s

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