webapp/glyph.py: fix incorrect display of 'title' URI parameter

[Marek77]

When passing an URI-encoded string (e.g. '&title=Hello%20World%21'), display 'Hello World!' instead in graph title.

Graph before the fix:

Fixed version:

[codecov-io]

Current coverage is 66.50% (diff: 0.00%)

Merging #1784 into master will not change coverage

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[obfuscurity]

Would you mind adding tests for this?

[Marek77]

As the fix changes the generated image, I admit I have hard time seeing what to test and how.

[iksaif]

I guess you can mock drawVTitle to validate that its being called with the correct argument

[deniszh]

Not sure if a test is needed here. unquote_plus() in known function and fix is quite minor.

[cbowman0]

To make test coverage for this is a large effort because of the lack of general test coverage in glyph.pp. I'm comfortable with this change.

[deniszh]

Thanks! Merging