Fix handling of \values keyword

[FliegendeWurst]

Related Issue

This pull request resolves #3717.

Intended Change

Fix by always using the type for Seq, not the type of the containing class.

Plan

• Add a simple test case for usage of \values

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: a file with \values now loads a bit further (see Enhanced-for loop example with \values not loadable #3717 (comment))

Additional information and contact(s)

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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.97%. Comparing base (2aa39bb) to head (75024b9).
⚠️ Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
.../de/uka/ilkd/key/speclang/njml/JmlTermFactory.java	0.00%	2 Missing ⚠️
...java/de/uka/ilkd/key/speclang/njml/Translator.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3718      +/-   ##
============================================
- Coverage     47.99%   47.97%   -0.02%     
- Complexity    16046    16052       +6     
============================================
  Files          1683     1683              
  Lines         96044    96094      +50     
  Branches      15387    15394       +7     
============================================
+ Hits          46093    46100       +7     
- Misses        44681    44722      +41     
- Partials       5270     5272       +2     

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