Resolve dictionary key override

[JorjMcKie]

Key "dictkey_desc" was defined twice, such that places expecting a "description" instead received "descender". Added a different key, "dictkey_descr" with a string value of "description".

Addresses issue #4050.

[julian-smith-artifex-com]

Test failure is:

2024-11-14T11:24:38.8227594Z ________________________________ test_file_info ________________________________
2024-11-14T11:24:38.8228177Z 
2024-11-14T11:24:38.8228363Z     def test_file_info():
2024-11-14T11:24:38.8229496Z         path = os.path.abspath(f'{__file__}/../../tests/resources/test_annot_file_info.pdf')
2024-11-14T11:24:38.8232659Z         document = pymupdf.open(path)
2024-11-14T11:24:38.8233236Z         results = list()
2024-11-14T11:24:38.8233733Z         for i, page in enumerate(document):
2024-11-14T11:24:38.8234419Z             print(f'{i=}')
2024-11-14T11:24:38.8234890Z             annotations = page.annots()
2024-11-14T11:24:38.8235526Z             for j, annotation in enumerate(annotations):
2024-11-14T11:24:38.8236271Z                 print(f'{j=} {annotation=}')
2024-11-14T11:24:38.8236871Z                 t = annotation.type
2024-11-14T11:24:38.8237857Z                 print(f'{t=}')
2024-11-14T11:24:38.8238567Z                 if t[0] == pymupdf.PDF_ANNOT_FILE_ATTACHMENT:
2024-11-14T11:24:38.8239352Z                     file_info = annotation.file_info
2024-11-14T11:24:38.8240127Z                     print(f'{file_info=}')
2024-11-14T11:24:38.8240767Z                     results.append(file_info)
2024-11-14T11:24:38.8241402Z >       assert results == [
2024-11-14T11:24:38.8242267Z                 {'filename': 'example.pdf', 'descender': '', 'length': 8416, 'size': 8992},
2024-11-14T11:24:38.8243512Z                 {'filename': 'photo1.jpeg', 'descender': '', 'length': 10154, 'size': 8012},
2024-11-14T11:24:38.8244347Z                 ]
2024-11-14T11:24:38.8245208Z E       AssertionError: assert [{'descriptio...'size': 8012}] == [{'descender'...'size': 8012}]
2024-11-14T11:24:38.8246123Z E         
2024-11-14T11:24:38.8247509Z E         At index 0 diff: {'filename': 'example.pdf', 'description': '', 'length': 8416, 'size': 8992} != {'filename': 'example.pdf', 'descender': '', 'length': 8416, 'size': 8992}
2024-11-14T11:24:38.8249019Z E         Use -v to get more diff
2024-11-14T11:24:38.8249470Z 
2024-11-14T11:24:38.8259421Z /project/tests/test_annots.py:345: AssertionError

I.e. 'descender': '' has changed to'description': ''.

[JorjMcKie]

Thanks for helping to locate this error.
Will make resp. changes.