API: Update 'value' in API Box type to be optional (reflecting updated get…

[gmalouf]

Summary

Update 'value' in API Box type to be optional (reflecting updated getApplicationBoxes semantics).

Test Plan

Existing tests should pass.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 51.83%. Comparing base (64ae8b0) to head (2062b56).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
daemon/algod/api/server/v2/handlers.go	0.00%	3 Missing ⚠️
cmd/goal/box.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6333      +/-   ##
==========================================
- Coverage   51.86%   51.83%   -0.03%     
==========================================
  Files         653      653              
  Lines       87547    87548       +1     
==========================================
- Hits        45408    45384      -24     
- Misses      39264    39290      +26     
+ Partials     2875     2874       -1     

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