Bug(Wallet): persist funding address secret key for Bob Taker

[TheCharlatan]

This was missed in the original PR #517.

[codecov-commenter]

Codecov Report

Merging #545 (5bda510) into main (57bc656) will decrease coverage by 0.0%.
The diff coverage is 0.0%.

@@           Coverage Diff           @@
##            main    #545     +/-   ##
=======================================
- Coverage   12.0%   12.0%   -0.0%     
=======================================
  Files         34      34             
  Lines      10308   10316      +8     
=======================================
- Hits        1241    1240      -1     
- Misses      9067    9076      +9     

Impacted Files	Coverage Δ
src/walletd/runtime.rs	0.0% <0.0%> (ø)
src/syncerd/types.rs	24.9% <0.0%> (-0.5%)	⬇️

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