Fix upper case font name support

[CY-Qiu]

e.g. Fixes #638
Fix upper case font name support.
Sorry I'm not very familiar with the pr system.

Checklist:

• The GitHub pipeline is OK (green),
  meaning that both pylint (static code analyzer) and black (code formatter) are happy with the changes of this PR.

• A unit test is covering the code added / modified by this PR

• This PR is ready to be merged

• In case of a new feature, docstrings have been added, with also some documentation in the docs/ folder

• A mention of the change is present in CHANGELOG.md

By submitting this pull request, I confirm that my contribution is made under the terms of the GNU LGPL 3.0 license.

[Lucas-C]

Note: this is a replacement for PR #646

[Lucas-C]

👍

[Lucas-C]

pylint is being very strict... hence the failing GitHub Actions checks.

$ pylint fpdf test tutorial/tuto*.py
************* Module test.fonts.test_add_font
test/fonts/test_add_font.py:114:0: C0305: Trailing newlines (trailing-newlines)

You can either disable this trailing-newlines rule in .pylintrc,
or just remove a newline at the end of test/fonts/test_add_font.py

[Lucas-C]

This time it's the black code formatter that's complaining... 😄
The related documentation is here: https://pyfpdf.github.io/fpdf2/Development.html#code-auto-formatting

You just need to run the black command in the repository directory.

I can do it myself by adding a commit to your branch if you want.

[Lucas-C]

Merged! Thank you @CY-Qiu 😄