Reset Notifications min version to 10240

[andrewleader]

Partially addresses #3581 issue 2

PR Type

What kind of change does this PR introduce?

• Build or CI related changes

What is the current behavior?

Min version of UWP package in master incorrectly got bumped to 17763

What is the new behavior?

Min version of UWP package is 10240. Had to make sure the DefaultTargetMinVersion and TargetMinVersion properties were set in the Notifications project (so the overall default of 17763 didn't get used).

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Pull Request has been submitted to the documentation repository instructions. Link:
• Sample in sample app has been added / updated (for bug fixes / features)
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Header has been added to all new source files (run build/UpdateHeaders.bat)
• Contains NO breaking changes

Other information

[ghost]

Thanks andrewleader for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌

[andrewleader]

Tested CI-generated NuGet, it worked! Ready to merge

[ghost]

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