libreoffice: Fix pre_install script bug

[StarsbySea]

Fix tiny logical bug in pre_install caused by ScoopInstaller/Scoop#5116 which changed the config name from MSIEXTRACT_USE_LESSMSI to use_lessmsi

Closes #8920

• I have read the Contributing Guide.

[tech189]

Thanks for your PR! I updated the description to explain the fix a bit more and made a suggestion. I don't think this PR fixes #8920 though, that issue has no problem with running the pre_install script.

[StarsbySea]

You are right about the code suggestion, I tested it locally and it passed. But there are a few more issues I would like to add.

1. Regarding the LibreOffice shortcuts error #8920 issue, I think the cause should be due to the update upstream of scoop, which causes get_config MSIEXTRACT_USE_LESSMSI $false to always return false, even though use_lessmsi has been set to true, and I think this is causing the problem. Maybe we should migrate all the MSIEXTRACT_USE_LESSMSI fields in the codebase to use_lessmsi?
2. specifying $default with get-config does not cause a new configuration to be created, it just changes the default value returned if the value is taken as null.

I have made some code changes, will you take another look?

[StarsbySea]

I think those picture says something haha

[StarsbySea]

Solve in #9493