Update source package manifest to include _web.js and _web.css

[Hook25]

Description:

As described in this comment related to packaging for debian, we may need to update the MANIFEST.in to include urwid/display/_web.js and urwid/dispaly/_web.css. If this is not done any source package, to the best of my understanding, will be missing them and producing a package that fails to upload urwid.display.web as is the case right now in Ubuntu24.04 and Debian.

Source package content in Ubuntu Noble: file list (link)

Note: I tried but failed to verify this on debian, I will need someone more experienced than me to double check. In this Launchpad discussion the package is described as copied over from debian, so they should be the same

See:

root@noble:~# apt install python3-setuptools python3-urwid
[...]
Unpacking python3-urwid (2.4.1-0.2) ...
Setting up python3-urwid (2.4.1-0.2) ...
[...]
root@noble:~# python3
Python 3.11.7 (main, Dec  8 2023, 14:22:46) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import urwid.display.web
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/urwid/display/web.py", line 52, in <module>
    _js_code = CURRENT_DIR.joinpath("_web.js").read_text("utf-8")
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/pathlib.py", line 1059, in read_text
    with self.open(mode='r', encoding=encoding, errors=errors) as f:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/pathlib.py", line 1045, in open
    return io.open(self, mode, buffering, encoding, errors, newline)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: '/usr/lib/python3/dist-packages/urwid/display/_web.js'

[coveralls]

Pull Request Test Coverage Report for Build 7554793337

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 69.853%

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Totals
Change from base Build 7543314198:	0.0%
Covered Lines:	8341
Relevant Lines:	12020

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💛 - Coveralls