Cleanup format_number

[SchrodingersGat]

• Removed unused line
• Ref: https://github.com/inventree/InvenTree/pull/8482

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.66%. Comparing base (ad6f859) to head (5954d9a). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8529 +/- ## ========================================== - Coverage 84.66% 84.66% -0.01% ========================================== Files 1178 1178 Lines 53585 53584 -1 Branches 2026 2026 ========================================== - Hits 45367 45365 -2 - Misses 7696 7697 +1 Partials 522 522 ``` | [Flag](https://app.codecov.io/gh/inventree/InvenTree/pull/8529/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | Coverage Δ | | |---|---|---| | [backend](https://app.codecov.io/gh/inventree/InvenTree/pull/8529/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree) | `85.95% <ø> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=inventree#carryforward-flags-in-the-pull-request-comment) to find out more.

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