repair the axiom generation for adts defined in JavaDL

[mattulbrich]

Related Issue

This pull request addresses #3427, but does not solve it.

Intended Change

The axiom taclet created for adt was not applicable. It is applicable now.

Plan

• remove the "notFreeIn" clause from the generated taclet
• remove the find clause from the taclet.

Type of pull request

• Bug fix (non-breaking change which fixes an issue)
• There are changes to the (Java) code

Ensuring quality

• I have tested the feature as follows: Looked at the translation of a few examples

It is a small change in the creation of a taclet.

The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.

[mattulbrich]

Addressed during the 3rd HacKeYthon.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.33%. Comparing base (a0c4f81) to head (46ef350).
Report is 13 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3556      +/-   ##
============================================
- Coverage     38.33%   38.33%   -0.01%     
+ Complexity    17258    17257       -1     
============================================
  Files          2111     2111              
  Lines        127632   127630       -2     
  Branches      21461    21461              
============================================
- Hits          48926    48923       -3     
  Misses        72695    72695              
- Partials       6011     6012       +1     

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