Import Page: Add exclusion of potential duplicates

[TheAxelander]

Right now only real duplicates are filtered. Consider adding a new section with potential duplicates where only a subset on the checked fields are equal.

Example:

	Date	Payee	Memo	Amount
Existing transaction	2023-01-01	Payee ABC	My Memo Text	12,34
Import transaction	2023-01-01	Payee ABC (Lorem)	My Memo Text	12,34	Potential duplicate

	Date	Payee	Memo	Amount
Existing transaction	2023-01-01	Payee ABC	My Memo Text	12,34
Import transaction	2023-01-01	Payee ABC	My Memo Text with Lorem	12,34	Potential duplicate

[TheAxelander]

Not a new feature. It was just not working. Fixed with #156