More error_details on DepositTooLow

[karlb]

As requested by @hackaugusto.

[codecov]

Codecov Report

Merging #761 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #761   +/-   ##
=======================================
  Coverage   90.14%   90.14%           
=======================================
  Files          35       35           
  Lines        2546     2546           
  Branches      325      325           
=======================================
  Hits         2295     2295           
  Misses        190      190           
  Partials       61       61           

Impacted Files	Coverage Δ
src/pathfinding_service/api.py	95.65% <100.00%> (ø)

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[palango]

Nice!