remove unnecessary code in json::parse_item<str>

[bbbgan]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.32 🎉

Comparison is base (e1f20e2) 43.29% compared to head (a6e3f15) 43.61%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   43.29%   43.61%   +0.32%     
==========================================
  Files          36       36              
  Lines        6431     6472      +41     
==========================================
+ Hits         2784     2823      +39     
- Misses       3647     3649       +2     

Impacted Files	Coverage Δ
iguana/json_reader.hpp	80.00% <ø> (+2.72%)	⬆️
test/unit_test.cpp	99.53% <100.00%> (ø)

... and 2 files with indirect coverage changes

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