Allow testimony to be recorded from any "wit" position

[in1tiate]

for backgrounds with multiple wit positions

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 12.80%. Comparing base (3c864e1) to head (f20d9f8).

Files	Patch %	Lines
core/src/packet/packet_ms.cpp	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #346 +/- ## ======================================= Coverage 12.80% 12.80% ======================================= Files 56 56 Lines 4750 4750 ======================================= Hits 608 608 Misses 4142 4142 ```

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