fix: search path for json input

[charles-cooper]

What I did

fix for ape-vyper -- apparently, vvm is being called with -p /home/a/b/c/my_project/contracts/, and then the source filename in the json input is foo.vy.

How I did it

How to verify it

Commit message

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Description for the changelog

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.76%. Comparing base (b4429cf) to head (528f312). Report is 164 commits behind head on master.

Files	Patch %	Lines
vyper/cli/vyper_json.py	0.00%	4 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (b4429cf) and HEAD (528f312). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (b4429cf)	HEAD (528f312)
	68	61

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3828       +/-   ##
===========================================
- Coverage   85.19%   68.76%   -16.43%     
===========================================
  Files          92       92               
  Lines       13916    13919        +3     
  Branches     3118     3119        +1     
===========================================
- Hits        11856     9572     -2284     
- Misses       1565     3629     +2064     
- Partials      495      718      +223     

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[charles-cooper]

i'm actually removing the -p option for json input in https://github.com/vyperlang/vyper/pull/3891, there will be a search_paths option though

[charles-cooper]

closing since #3891 gets rid of the -p option for standard json input