fix: Fixes erroneous non-null args.env check

[Keanu73]

Upon further investigation of #788 and #860, I found that, by default, if "env" is not specified, VSCode does not set it to undefined, but sets it to an empty object {}.

The extension code here checks if args.env is not equal to undefined. By logic, undefined is not equal to {} (thanks JavaScript..), thus, with the default "Listen for Xdebug" configuration launched, it will still throw this error needlessly.

I've made a fix for this by, instead, checking if args.env is equal to true (which is the equivalent of !== undefined) - and, also checks if there are more than 0 keys in the object, a.k.a the object is not empty. I can confirm that the debugger now runs normally with the default "Listen for Xdebug" configuration in my project.

[codecov[bot]]

Codecov Report

Merging #872 (367087d) into main (f2546fd) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #872      +/-   ##
==========================================
+ Coverage   69.90%   69.96%   +0.06%     
==========================================
  Files          12       12              
  Lines        1834     1838       +4     
  Branches      375      379       +4     
==========================================
+ Hits         1282     1286       +4     
  Misses        552      552              

Impacted Files	Coverage Δ
src/phpDebug.ts	63.83% <100.00%> (+0.21%)	:arrow_up:

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[github-actions[bot]]

:tada: This PR is included in version 1.29.1 :tada:

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