`eframe`: If both `glow` and `wgpu` features are enabled, default to `wgpu` #8359

Job	Run time
cargo-deny aarch64-apple-darwin	47s
Check wasm32 + wasm-bindgen	2m 43s
android	23s
cargo-deny aarch64-linux-android	43s
cargo-deny i686-pc-windows-gnu	39s
Format + check + test	5m 58s
cargo-deny i686-pc-windows-msvc	39s
Check Windows	2m 24s
cargo-deny i686-unknown-linux-gnu	39s
cargo-deny wasm32-unknown-unknown	47s
cargo-deny x86_64-apple-darwin	35s
cargo-deny x86_64-pc-windows-gnu	39s
cargo-deny x86_64-pc-windows-msvc	40s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-redox	38s
	19m 32s

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