fixes: #28 DF408 Scaling is incorrect

[jcmb]

Scaling for DF408 was going the wrong way.

pyrtcm Pull Request Template

Description

DF408 Scaling was making the values larger instead of smaller.

See issue #28 for more of the details

Fixes # (issue)

28

Testing

Sample included in the issue. tests/*.py ran manually.

Checklist:

• [X] My code follows the style guidelines of this project (see CONTRIBUTING.MD).
• [X] I have performed a self-review of my own code.
• [X] (if appropriate) I have cited my RTCM documentation source(s).
• [X ] I have commented my code, particularly in hard-to-understand areas.
• [ N/A ] I have made corresponding changes to the documentation.
• [ ] (if appropriate) I have added test cases to the tests/test_*.py unittest suite to maintain >= 99% code coverage.
• [X ] I have tested my code against the full tests/test_*.py unittest suite.
• [X ] My changes generate no new warnings.
• [X ] Any dependent changes have been merged and published in downstream modules.
• [ X] I have signed my commits.
• [X ] I understand and acknowledge that the code will be published under a BSD 3-Clause license.

[semuadmin]

Hi @jcmb Good spot - thanks!

Appreciate the contribution, but in future could I request that you:

1. Sign all commits (you've ticked the box but the commit wasn't actually signed).
2. Update the relevant test cases.