Ignore the InstallerLocale if it is `und`

Description of the new feature / enhancement

The InstallerLocale value of the package Qalculate.Qalculate was accidentally changed to und (unknown language) in the PR https://github.com/microsoft/winget-pkgs/pull/159052, making it unable to update the package through WinGet (https://github.com/microsoft/winget-pkgs/issues/195410). Trying to run winget upgrade Qalculate.Qalculate results in the following logs:

2024-12-01 11:28:55.787 [CLI ] Starting installer selection.
2024-12-01 11:28:55.787 [CLI ] Installer [X86,msi,Machine,und] not applicable: Installer locale does not match required locale: undRequired locales: [] Or does not satisfy compatible match for Preferred Locales: [zh-CN]
2024-12-01 11:28:55.787 [CLI ] Installer [X64,msi,Machine,und] not applicable: Installer locale does not match required locale: undRequired locales: [] Or does not satisfy compatible match for Preferred Locales: [zh-CN]
2024-12-01 11:28:55.787 [CLI ] Terminating context: 0x8a15002b at C:\__w\1\s\external\pkg\src\AppInstallerCLICore\Workflows\UpdateFlow.cpp:be

The und stands for "unknown language" and should be ignored.

Proposed technical implementation details

No response

Start at AppInstallerCLICore/Workflows/UpdateFlow.cpp, the entry point shown in the logs, and trace how installer locales are matched against preferred locales. Identify the existing tests for installer selection and update them or add coverage so an und locale is ignored and the Qalculate.Qalculate upgrade can proceed.