Copy calculated JAVA_HOME path to make sure maven works

[DavyLandman]

Sometimes rascal is running inside of a jdk that is not the same as JAVA_HOME, or JAVA_HOME is note defined

Fixes #1770

[codecov]

Codecov Report

Merging #1771 (1272364) into main (d5dc281) will decrease coverage by 1%.
The diff coverage is n/a.

❗ Current head 1272364 differs from pull request most recent head aa7c0c2. Consider uploading reports for the commit aa7c0c2 to get more accurate results

@@           Coverage Diff           @@
##              main   #1771   +/-   ##
=======================================
- Coverage       48%     48%   -1%     
+ Complexity    5982    5975    -7     
=======================================
  Files          670     670           
  Lines        58304   58310    +6     
  Branches      8496    8496           
=======================================
- Hits         28413   28405    -8     
- Misses       27760   27771   +11     
- Partials      2131    2134    +3     

Impacted Files	Coverage Δ
src/org/rascalmpl/library/util/PathConfig.java	0% <ø> (ø)
...calmpl/interpreter/result/SetOrRelationResult.java	82% <0%> (-6%)	⬇️
src/org/rascalmpl/library/util/SemVerLib.java	55% <0%> (-4%)	⬇️
src/org/rascalmpl/unicode/UnicodeDetector.java	63% <0%> (-2%)	⬇️
...g/rascalmpl/interpreter/result/DateTimeResult.java	15% <0%> (-1%)	⬇️
src/org/rascalmpl/interpreter/result/Result.java	13% <0%> (-1%)	⬇️
src/org/rascalmpl/library/Prelude.java	42% <0%> (-1%)	⬇️

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