eframe: Remove warm-starting #7954

Job	Run time
android	21s
Check wasm32 + wasm-bindgen	2m 25s
Format + check + test	5m 10s
cargo-deny aarch64-apple-darwin	43s
Check Windows	2m 12s
cargo-deny aarch64-linux-android	38s
cargo-deny i686-pc-windows-gnu	42s
cargo-deny i686-pc-windows-msvc	42s
cargo-deny i686-unknown-linux-gnu	42s
cargo-deny wasm32-unknown-unknown	39s
cargo-deny x86_64-apple-darwin	37s
cargo-deny x86_64-pc-windows-gnu	52s
cargo-deny x86_64-pc-windows-msvc	46s
cargo-deny x86_64-unknown-linux-gnu	43s
cargo-deny x86_64-unknown-linux-musl	45s
cargo-deny x86_64-unknown-redox	41s
	18m 38s

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