feat: adding copyright text to BrandingText

[simonhyll]

What kind of change does this PR introduce?

• Bugfix
• Feature
• Docs
• New Binding issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes, and the changes were approved in issue #___
• No

Checklist

• When resolving issues, they are referenced in the PR's title (e.g fix: remove a typo, closes #___, #___)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.
• I have added a convincing reason for adding this feature, if necessary

Other information

I added the copyright field from the bundle configuration as BrandingText in NSIS in order for users to be able to get rid of the Nullsoft Install System vX.X.X text from their installer.

I wouldn't consider BrandingText to be a breaking change. If you leave the copyright field blank you still get the Nullsoft message. If you set the copyright text to something, it'll show up there.