BUG: Stakes corruption when delayed stakes move existing stakes to another court and juror is drawn

[jaybuidl]

Reproduction

1. Juror is staked in court A (10K) and B (15K)
2. In generating or drawing phase, juror moves his stakes from court B to court A
   → stakes in court A are increased immediately to 25K BUT stake decreased are delayed in court B (still 15K) due to the instant staking logic
3. Juror gets drawn several times in court A based on an INCORRECT stake of 25K + 15K = 40K, too many times!! Locked stakes in this dispute: 38K.
4. Phase goes to Staking, delayed stakes are executed: - It releases 40K - 38K = 2K to court A
   • It sets his stake in court B to 0
5. The juror is now missing 13K !!

Example

Root cause

Bug introduced by #990

Solution

Revert the instant staking logic for stake increases: too many edge cases and it made the code more complex in an area where it was already too complex.