Invalid `AdvancedTest.Level` and `AdvancedTest.URL` values

[delphidabbler]

Some values of the AdvancedTest.Level key in maths.ini are invalid. Some appear corrupted while one has an erroneous value.

Some values of the AdvancedTest.URL key in several .ini files are malformed URLs, with missing https protocols.

[delphidabbler]

Malformed AdvancedTest.URL values are in date.ini (1) & hex.ini (1).