Convert .bat scripts to CRLF line-ending

[phongse]

Description

.bat files on Windows is sensitive to line-endings and using LF causes unintended runtime behavior such as not being able to download user.js.new, not following a linear runtime but branching out in other parts of the script.

I converted both scripts to use CRLF endings, a typo in setting the _version variable and properly detecting thunderbird user.js _name.

Reason and / or context

Fix unintended behavior in the scripts.

How has this been tested ?

Tested both scripts with default setup, no special flags passed to the scripts.

Types of changes :

• Bug fix (non-breaking change which fixes an issue)
• Typo / style fix (non-breaking change which improves readability)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist :

• My changes looks good ;
• I agree that my code may be modified in the future ;
• My code follows the code style of this project (see .eslint.config.mjs).