Lint fixes.

crates/api/src/application/window.rs

crates/api/src/event/mod.rs

crates/api/src/layout/scroll.rs

crates/api/src/render_object/mod.rs

crates/api/src/systems/event_state_system.rs

crates/api/src/systems/init_system.rs

crates/api/src/systems/post_layout_state_system.rs

crates/api/src/systems/render_system.rs

crates/api/src/widget/build_context.rs

crates/api/src/widget/context.rs

crates/render/src/concurrent/mod.rs

crates/render/src/lib.rs

crates/render/src/raqote/mod.rs

crates/render/src/web/mod.rs

crates/utils/src/color.rs

crates/widgets/src/items_widget.rs

crates/widgets/src/list_view.rs

crates/widgets/src/switch.rs

crates/widgets/src/text_box.rs