Ledger list should not have maximum height

[jkup]

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Fix #4537

Test Plan:

Instead of a fixed-height box with it's own scroll. The entire Payments page should scroll if you have enough publishers.

[diracdeltas]

i added the fixed-height thing because it was in one of @bradleyrichter's original design specs. just making sure he is ok with this change

[jkup]

@diracdeltas totally. People were complaining that they didn't know you could scroll so he suggested this change here: #3888 (comment)

[diracdeltas]

ah ok, cool

[diracdeltas]

lgtm, thanks