chore: remove add_native_decimals balance check

[kerber0x]

Description and Motivation

This PR removes the add_native_decimals balance check, since the pool factory is permissioned there's no risk on this one. Also, this change will allow allowing another wallet to create pools via authz without the need to send any balances to the contract.

Related Issues

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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

All modified and coverable lines are covered by tests ✅

Comparison is base (ec16d59) 94.51% compared to head (a5ee21c) 94.51%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #233   +/-   ##
=======================================
  Coverage   94.51%   94.51%           
=======================================
  Files         218      218           
  Lines       24720    24708   -12     
=======================================
- Hits        23364    23354   -10     
+ Misses       1356     1354    -2     

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