financial#46 - clean money format at form layer

[MegaphoneJon]

Overview

When specifying a donation amount of $1000 or more (on a monolingual en_US site), the amount is saved as $1,000.00.
When you press save again, the comma is treated as a decimal separator, and so it's resaved as $1.

Before

19 second screencast showing the issue:
https://lab.civicrm.org/dev/financial/uploads/3efa6a65f2585256b3792f512ce29416/thousandseparatorbug-2019-02-27_16.07.04.mkv

After

Amount saves correctly.

Technical Details

The "Amounts" tab of contribution page configuration doesn't clean the money format at the form level. Since cleaning at the BAO level was removed in 5.9.0, we need to clean the money at the form level.

[civibot]

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[eileenmcnaughton]

I tested this & it worked fine - it looks correct to me - merge on pass.