monthly statement - AC values sum to amount greater than AC budget

[LaurenWags]

Description

Probably due to rounding, but AC values on the monthly statement (in Auto-Contribute section) sometimes add up to greater than the actual AC amount.

Steps to Reproduce

1. Have mix of verified and non-verified sites set up for AC
2. Have AC to thru
3. Look at monthly statement

Actual result:

0.1 + 0.1 + 0.3 + 4.3 + 0.5 = 5.3, but AC amount was only 5.0 BAT

Expected result:

AC values add up to AC budget

Reproduces how often:

fairly easily, number of sites you have and your budget determines how far off you are though.

Brave version (brave://version info)

Brave	1.7.71 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	macOS Version 10.14.6 (Build 18G3020)

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a
• Can you reproduce this issue with the beta channel? yes
• Can you reproduce this issue with the dev channel? yes
• Can you reproduce this issue with the nightly channel? unsure, probably

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc @NejcZdovc @mandar-brave

[LaurenWags]

Note, amount on Transactions section matches the amount in the Summary above, not what the sum from Auto Contribute section is:

[NejcZdovc]

@mandar-brave what should we do in this case? if we have one decimal place we will always have this rounding problems