Fix inappropriate `WeakPtrFactory` use #4823

Job	Run time
build (Linux, ubuntu-22.04, RelWithDebInfo, 5.15.2, desktop)	2m 21s
build (Linux, ubuntu-22.04, RelWithDebInfo, 6.4.2, desktop)	2m 38s
build (macOS, macos-12, RelWithDebInfo, 5.15.2, desktop, 10.13, x86_64)	53s
build (macOS, macos-12, RelWithDebInfo, 6.4.2, desktop, 10.14, x86_64;arm64)	1m 22s
build (win64_msvc2019, windows-2022, RelWithDebInfo;Debug, x64, 14.29, 5.15.2, desktop, win64_msv...	2m 26s
build (win64_msvc2019, windows-2022, RelWithDebInfo;Debug, x64, 14.29, 6.4.2, desktop, win64_msvc...	2m 26s
build (win64_mingw, windows-2022, RelWithDebInfo, mingw810_64, 8.10.0, 5.15.2, desktop, win64_min...	2m 25s
build (win64_mingw, windows-2022, RelWithDebInfo, mingw1120_64, 11.2.0, 6.4.2, desktop, win64_min...	2m 32s
test-tarball	0s
Release QMapLibreGL	0s
	17m 3s

Provide feedback