fix: pool-manager max spread assertion

[kerber0x]

Description and Motivation

Related Issues

This is an issue we solved in the past in V1, but somehow was lingering in V2.

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Checklist:

• I have read Migaloo's contribution guidelines.
• My pull request has a sound title and description (not something vague like Update index.md)
• All existing and new tests are passing.
• I updated/added relevant documentation.
• The code is formatted properly cargo fmt --all --.
• Clippy doesn't report any issues cargo clippy -- -D warnings.
• I have regenerated the schemas if needed cargo schema.

[codecov]

Codecov Report

Attention: Patch coverage is 80.64516% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 89.91%. Comparing base (deebeee) to head (b75f791).
Report is 2 commits behind head on release/v2_contracts.

❗ Current head b75f791 differs from pull request most recent head 05d5afc. Consider uploading reports for the commit 05d5afc to get more accurate results

Files	Patch %	Lines
...ontracts/liquidity_hub/pool-manager/src/helpers.rs	50.00%	6 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                    @@
##           release/v2_contracts     #348      +/-   ##
========================================================
+ Coverage                 89.86%   89.91%   +0.04%     
========================================================
  Files                       261      261              
  Lines                     27339    27334       -5     
========================================================
+ Hits                      24569    24576       +7     
+ Misses                     2770     2758      -12     

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