Remove Contribution Custom fields from the Reports.

Merged KarinG requested to merge report_edit into master

When selecting Contribution custom fields in the Tax Receipts Issued report - we get DB Errors - fatal errors. Seeing this in two projects. Since there can be multiple contributions on one TaxReceipt - I think it makes sense that we constrain the custom fields that can be inject to of entity 'Individual', 'Contact' and 'Organization' only.

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