CMake: Fix WiX installer downgrades with versioned binaries
Since !1412 (merged) our binaries have version information that prevents a .msi downgrade from replacing them by default. Configure the re-install mode:
- a: reinstall all files regardless of version
- m: rewrite all per-machine registry entries
- u: rewrite all per-user registry entries
- s: reinstall shortcuts and icons
Fixes: #19006 (closed)