Web: use raw data in `DeviceEvent::MouseMotion` when using `CursorGrabMode::Confined` #6531

Job	Run time
Check formatting	11s
Minimize JavaScript	8s
Run cargo-deny on Android	22s
Check for typos	3s
Run cargo-deny on iOS	21s
Run cargo-deny on Linux	21s
Run cargo-deny on macOS	21s
Test stable Windows 64bit MSVC	2m 33s
Run cargo-deny on Redox OS	21s
Test stable Windows 32bit MSVC	4m 5s
Run cargo-deny on Web	20s
Test stable Windows 64bit GNU	2m 17s
Run cargo-deny on Windows	20s
Test stable Windows 32bit GNU	2m 18s
Test stable Linux 32bit	2m 20s
Test stable Linux 64bit	1m 51s
Test stable X11	1m 37s
Test stable Wayland	1m 26s
Test stable Android	1m 11s
Test stable Redox OS	19s
Test stable macOS	59s
Test stable iOS x86_64	1m 8s
Test stable iOS Aarch64	57s
Test stable Web	1m 19s
Test nightly Windows 64bit MSVC	2m 2s
Test nightly Windows 32bit MSVC	1m 27s
Test nightly Windows 64bit GNU	2m 13s
Test nightly Windows 32bit GNU	2m 14s
Test nightly Linux 32bit	1m 54s
Test nightly Linux 64bit	1m 38s
Test nightly X11	1m 33s
Test nightly Wayland	1m 31s
Test nightly Android	1m 18s
Test nightly Redox OS	25s
Test nightly macOS	1m 16s
Test nightly iOS x86_64	53s
Test nightly iOS Aarch64	57s
Test 1.73 Windows 64bit MSVC	1m 7s
Test 1.73 Windows 32bit MSVC	1m 12s
Test 1.73 Windows 64bit GNU	1m 27s
Test 1.73 Windows 32bit GNU	1m 16s
Test 1.73 Linux 32bit	1m 16s
Test 1.73 Linux 64bit	57s
Test 1.73 X11	52s
Test 1.73 Wayland	43s
Test 1.73 macOS	45s
Test 1.73 iOS x86_64	38s
Test 1.73 iOS Aarch64	44s
Test 1.73 Web	37s
Test 1.73 Android	40s
Test nightly Web	1m 15s
Test nightly Web Atomic	1m 26s
	1h 1m 24s

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