gh-130860: fix width calculation, when separators in fractional part

[skirpichev]

This amends f39a07b

• Issue: Thousands separators in fractional part are ignored in width computation #130860

[vstinner]

LGTM

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Ubuntu 22.04 BigMem 3.x (tier-2) has failed when building commit 2352bd4.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1618/builds/802) and take a look at the build logs.
4. Check if the failure is related to this commit (2352bd4) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1618/builds/802

Failed tests:

• test_interpreters

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
File "/home/buildbot/buildarea/3.x.diegorusso-aarch64-bigmem.bigmem/build/Lib/threading.py", line 1054, in _bootstrap_innerself.run()
~~~~~~~~^^
File "/home/buildbot/buildarea/3.x.diegorusso-aarch64-bigmem.bigmem/build/Lib/threading.py", line 996, in runself._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/buildbot/buildarea/3.x.diegorusso-aarch64-bigmem.bigmem/build/Lib/test/test_interpreters/test_stress.py", line 47, in run
interp = interpreters.create()
File "/home/buildbot/buildarea/3.x.diegorusso-aarch64-bigmem.bigmem/build/Lib/test/support/interpreters/__init__.py", line 76, in createid= _interpreters.create(reqrefs=True)
interpreters.InterpreterError: interpreter creation failed
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