Change `run_app(app: &mut A)` to `run_app(app: A)` #6380

Job	Run time
Minimize JavaScript	8s
Run cargo-deny on Android	20s
Check formatting	12s
Run cargo-deny on iOS	19s
Run cargo-deny on Linux	20s
Test stable Windows 64bit MSVC	1m 44s
Check for typos	5s
Run cargo-deny on macOS	18s
Test stable Windows 32bit MSVC	2m 29s
Run cargo-deny on Redox OS	19s
Test stable Windows 64bit GNU	1m 55s
Run cargo-deny on web	22s
Test stable Windows 32bit GNU	2m 56s
Run cargo-deny on Windows	19s
Test stable Linux 32bit	1m 50s
Test stable Linux 64bit	1m 50s
Test stable X11	1m 31s
Test stable Wayland	1m 28s
Test stable Android	1m 4s
Test stable Redox OS	22s
Test stable macOS	55s
Test stable iOS x86_64	43s
Test stable iOS Aarch64	45s
Test stable web	56s
Test nightly Windows 64bit MSVC	1m 4s
Test nightly Windows 32bit MSVC	1m 16s
Test nightly Windows 64bit GNU	2m 24s
Test nightly Windows 32bit GNU	2m 31s
Test nightly Linux 32bit	1m 46s
Test nightly Linux 64bit	1m 32s
Test nightly X11	1m 24s
Test nightly Wayland	1m 32s
Test nightly Android	59s
Test nightly Redox OS	24s
Test nightly macOS	53s
Test nightly iOS x86_64	49s
Test nightly iOS Aarch64	49s
Test nightly web	56s
Test 1.73 Windows 64bit MSVC	1m 13s
Test 1.73 Windows 32bit MSVC	1m 5s
Test 1.73 Windows 64bit GNU	1m 8s
Test 1.73 Windows 32bit GNU	1m 3s
Test 1.73 Linux 32bit	1m 12s
Test 1.73 Linux 64bit	53s
Test 1.73 X11	43s
Test 1.73 Wayland	48s
Test 1.73 Redox OS	23s
Test 1.73 macOS	33s
Test 1.73 iOS x86_64	29s
Test 1.73 iOS Aarch64	32s
Test 1.73 web	35s
Test 1.73 Android	34s
Test nightly web Atomic	1m 13s
	53m 53s

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