nvda

1984b9e9 - Copy the system config when updating from 32- to 64-bit NVDA (#19068)

Copy the system config when updating from 32- to 64-bit NVDA (#19068) Fixes #19022 ### Summary of the issue: When updating frm 32-bit NVDA to 64-bit NVDA, the system config is lost. ### Description of user facing changes: The system config is retained when updating from 32- to 64-bit NVDA. ### Description of developer facing changes: None ### Description of development approach: Add a keyword-only parameter, `prefix`, to `config._setSystemConfig`, which by default is set to `sys.prefix` so as not to break existing callers. In the installer, if `shouldCleanX86` is `True` and the x86 copy has a `systemConfig` directory, use `config._setSystemConfig` to copy the 32-bit copy's system config to the 64-bit directory before deleting the 32-bit copy's directory. ### Testing strategy: Installed nvda_snapshot_alpha-52864,2772fde8. Changed the user configuration, and used the "Use currently saved settings during sign-in and on secure screens (requires administrator privileges)" button to copy the config to the system profile. Checked that the expected files were in `C:\Program Files (x86)\nvda\systemConfig`. Ran a launcher built from this branch. Installed NVDA. Checked that the same contents were present in `C:\Program Files\nvda\systemConfig`. Performed the abovesteps, but without changing the system config, and ensured that the upgrade process worked as expected and no `systemConfig` directory was created. ### Known issues with pull request: None