Fixed rounding bug in WebSurfer contrib tests.

[afourney]

Why are these changes needed?

Fixes a silly rounding bug that causes some websurfer contrib tests to fail.
The bug was previously unnoticed, but the length of the remote webpage used in the test has changed, causing the page breaks to fall in different locations.

Related issue number

N/A

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1ab2354) 32.48% compared to head (9a84239) 32.48%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1417   +/-   ##
=======================================
  Coverage   32.48%   32.48%           
=======================================
  Files          41       41           
  Lines        4907     4907           
  Branches     1120     1120           
=======================================
  Hits         1594     1594           
  Misses       3187     3187           
  Partials      126      126           

Flag	Coverage Δ
unittests	32.44% <ø> (ø)

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[BeibinLi]

LGTM

[gagb]

There is no such thing as a silly bug Adam!

[afourney]

Code formatting shows all green for me. I've got the latest version of the repo and uninstalled / re-installed pre-commit checks:

I also did not edit any notebooks in this PR. It's not clear why formatting checks are failing.