fix: decimal precision issue with balance shell command

[mvadari]

High Level Overview of Change

The precision was incorrect for the balance of the accounts in the balance output. This PR fixes that precision issue. It would also be resolved by astanin/python-tabulate#176, but that will take longer to be approved.

Context of Change

Reported by @sgramkumar

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Before / After

Before:

SSX> balance
 account   |               balance | currency   | peer   | limit
-----------+-----------------------+------------+--------+---------
 main root | 99,999,998,999.999985 | XRP        |        |
 main door |            999.999940 | XRP        |        |
 side door | 99,999,999,999.999954 | XRP        |        |

After:

SSX> balance
 account   |               balance | currency   | peer   | limit
-----------+-----------------------+------------+--------+---------
 main root | 99,999,998,999.999980 | XRP        |        |
 main door |            999.999940 | XRP        |        |
 side door | 99,999,999,999.999950 | XRP        |        |

Test Plan

Tested manually, it works properly.

[sgramkumar]

looks good.

Works as expected.

SSX> balance
 account    |               balance | currency   | peer   | limit
------------+-----------------------+------------+--------+---------
 main root  | 99,999,993,999.999970 | XRP        |        |
 main door  |          2,000.000040 | XRP        |        |
 main alice |          3,999.999780 | XRP        |        |
 side door  | 99,999,998,999.999750 | XRP        |        |
 side bob   |          1,000.000000 | XRP        |        |
SSX> account_info
 account    |           balance |   flags |   owner_count | previous_txn_id                                                  |   previous_txn_lgr_seq |   sequence |   TicketCount
------------+-------------------+---------+---------------+------------------------------------------------------------------+------------------------+------------+---------------
 main root  | 99999993999999970 | 8388608 |             0 | 28C647B506252CCD02DD5448F6AF245D33D8DC6D4D758489B3341C6449720E97 |                     27 |          4 |
 main door  |        2000000040 | 1048576 |             5 | 1349E56F227FD2E3AAC11E376910CC2A0DD985F1EE4F4EC46A87582EE1740A09 |                     47 |         14 |             3
 main alice |        3999999780 |       0 |             0 | 1349E56F227FD2E3AAC11E376910CC2A0DD985F1EE4F4EC46A87582EE1740A09 |                     47 |         29 |
 side door  | 99999998999999750 | 1048576 |             4 | B3F723C22069AC29E6332C3F216478E72538BC200D76C6F90F5C008C2880CDD8 |                     53 |         11 |             3
 side bob   |        1000000000 |       0 |             0 | B3F723C22069AC29E6332C3F216478E72538BC200D76C6F90F5C008C2880CDD8 |                     53 |         53 |
SSX>