fix: Replaced incorrect use of tao_in_ratio with default_tao_in_i for "price < TAO emissions"

[mcjkula]

Description

Fix "price < TAO emissions" mechanism which would lead to unintended downward pressure on ALPHA tokens. The current implementation would incorrectly trigger the mechanism post-halving, leading to a decrease in TAO per ALPHA on subnets where "price > TAO emissions", but "price < TAO emissions ratio (%)".

Related Issue/s

• Incorrect use of tao_in_ratio instead of default_tao_in_i for "price < TAO emissions" #1909

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Breaking Change

N/A - This is a bug fix that corrects existing behavior without changing the intended functionality.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have run cargo fmt to ensure my code is formatted correctly (no cargo clippy)
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Screenshots (if applicable)

N/A