src: fix ContextifyContext property definer interception result

[legendecas]

This fixes that when defining a property, a definer callback
like a proxy handler would be invoked twice when the property
is writable.

Fixes: #52634

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.33%. Comparing base (1ddb754) to head (3fb03c6).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_contextify.cc	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #63549      +/-   ##
==========================================
+ Coverage   90.31%   90.33%   +0.01%     
==========================================
  Files         730      730              
  Lines      234161   234163       +2     
  Branches    43917    43924       +7     
==========================================
+ Hits       211486   211525      +39     
+ Misses      14408    14363      -45     
- Partials     8267     8275       +8     

Files with missing lines	Coverage Δ
src/node_contextify.cc	82.04% <85.71%> (-0.56%)	⬇️

... and 31 files with indirect coverage changes

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