order mode pane UI bugs..

[goodboy]

There have been lingering for some time and need to be resolved stat!

This likely has much to do with the previously documented problems in #220 as well.

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Bugs!

• on a units limit (for eg. for mnq futes): have an existing pp with
  all slots filled then increase the limit (eg. 6 -> 8) and then
  switching back to making the slots match the limit size, the limit
  will revert to it's previous value of 6..

futes_unit_limiter_is_wackPeek.2023-03-01.18-50.mp4

ideally the UX is,

• on any change to a units limit, for any discrete sized asset (legacy mkt equities, futes, opts..) that is greater then the # of slots, we should automatically change the slots to match the limit => since you can't have a slot that is any less then 1 unit.

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• for $fiat limit: 6k limit, enter < 6 slots, switch the slots
  count to 1 -> causes an empty / unfilled health bar to show instead
  of the fractional fill as prior.

single_slot_shows_empty_healthbar_Peek.2023-03-01.18-21.mp4