CORE: non-existent 42 wallet should exist

[JoeGruffins]

For a long time the error [ERR] CORE: non-existent 42 wallet should exist has been around:

2024-05-03 02:41:07.927 [TRC] MUX: "POST http://127.0.0.3:5758/api/newwallet HTTP/1.1" from 127.0.0.1:47976 - 200 12B in 431.15313ms
2024-05-03 02:41:08.028 [TRC] CORE[dcr]: Fallback fees set at 20 atoms/byte
2024-05-03 02:41:08.028 [TRC] CORE[dcr]: Fees rate limit set at 100 atoms/byte
2024-05-03 02:41:08.028 [TRC] CORE[dcr]: Redeem conf target set to 1 blocks
2024-05-03 02:41:08.040 [TRC] CORE[dcr][TXHISTORYDB]: All 0 tables opened in 0s

2024-05-03 02:41:08.237 [DBG] CORE[dcr]: tip change: 0 (6bef82c645999585f7255cb02672921ac2f5492820090cd635fe3a59d16b4f87) => 669 (1cee355787ba89f92a5b8cfd4eeac921f587074f001daae9a99c80d1c97386d4)
2024-05-03 02:41:08.237 [TRC] CORE: Processing tip change for dcr
2024-05-03 02:41:08.237 [ERR] CORE: non-existent 42 wallet should exist
2024-05-03 02:41:08.311 [INF] CORE: Created dcr wallet. Balance available = 0 / locked = 0 / locked in contracts = 0, Deposit address = SssQ6ThpSrDXngZ8Zr3Znw5NYpExatAU7o7
2024-05-03 02:41:08.311 [TRC] MUX: "POST http://127.0.0.3:5758/api/newwallet HTTP/1.1" from 127.0.0.1:48004 - 200 12B in 815.218188ms
2024-05-03 02:41:09.949 [TRC] CORE[ltc][TXHISTORYDB]: All 0 tables opened in 0s

2024-05-03 02:41:09.951 [DBG] CORE[ltc][SPV]: Starting native LTC wallet...

It doesn't seem to have an effect on anything, so we should silence it at least. To reproduce just make a new simnet dexc and the error should be there. It may only happen for brand new clients.