Fixes

• Resolved an issue with Currency Switcher not properly setting the currency when only one currency is supported by a particular payment gateway.
• When a logged in donor's preferred currency was auto-switched there was an issue with the donor then giving a custom amount in that currency that has been fixed.
• Resolved an issue with currency formatting the total amount correctly when the donor switches the payment gateway.
• An "Invalid amount" notice would display incorrectly when using custom currency amount in a multi-level donation form. Now no incorrect errors will display.