simplify exception wrapping in value_to

[grisumbras]

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[cppalliance-bot]

An automated preview of the documentation is available at https://1041.jsondocs.prtest.cppalliance.org/libs/json/doc/html/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.40%. Comparing base (b6c916f) to head (6071cd5).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1041      +/-   ##
===========================================
- Coverage    93.41%   93.40%   -0.01%     
===========================================
  Files           91       91              
  Lines         8667     8658       -9     
===========================================
- Hits          8096     8087       -9     
  Misses         571      571              

Files with missing lines	Coverage Δ
include/boost/json/detail/value_to.hpp	100.00% <100.00%> (ø)
include/boost/json/impl/conversion.hpp	100.00% <ø> (ø)

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[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/1041/pullrequest.html

[cppalliance-bot]

An automated preview of the documentation is available at https://1041.jsondocs.prtest.cppalliance.org/libs/json/doc/html/index.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/1041/pullrequest.html

[cppalliance-bot]

An automated preview of the documentation is available at https://1041.jsondocs.prtest.cppalliance.org/libs/json/doc/html/index.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/1041/pullrequest.html