fix: correct column numbers for line-1 breakpoints

[kjin]

Fixes #737

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[codecov]

Codecov Report

Merging #751 into master will increase coverage by 0.21%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #751      +/-   ##
==========================================
+ Coverage   85.45%   85.66%   +0.21%     
==========================================
  Files          13       13              
  Lines         949      949              
  Branches      193      193              
==========================================
+ Hits          811      813       +2     
+ Misses         76       75       -1     
+ Partials       62       61       -1

Impacted Files	Coverage Δ
src/agent/state/inspector-state.ts	89.8% <0%> (+0.97%)	⬆️

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[bcoe]

I basically did the same thing in one of my libraries.

https://github.com/istanbuljs/v8-to-istanbul/blob/master/lib/v8-to-istanbul.js#L11

[kjin]

Thanks, I did see that v8-to-istanbul was mentioned in the Node PR that made this change, though I didn't realize it was your library 👍