Don't make "Exclude From Mint" its own category

[mintfeedback]

I have been paying off student loans, and they were disproportionately skewing all of my visualizations, so I set all items in that category to "Exclude From Mint". I would rather keep the category as "Student Loan" but have the ability to exclude something from mint without changing its category. So more of a checkbox that says exclude as opposed to a whole 'nother category.

Carl