Fixes

• We found another conflict with the new "maximum" donation amount field and existing forms. This time forms NOT using custom fields would incorrectly display a validation error about a custom amount which prevented the donor from giving. [#3159](https://github.com/wordimpress/give/issues/3159)
• Ensure the minimum donation amount calculates properly with various international decimal separators. [#3176](https://github.com/wordimpress/give/issues/3176)