Corrected test when loading rdfs. It used type for is_a.

[francescalb]

Description

A bugfix in 0wlready2==0.46 corrected reutning what is returned when using type on dataclasses.
We had used type instead of is_a in the test and this has now been corrected.

Type of change

• Bug fix.
• New feature.
• Documentation update.
• Test update.

Checklist

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.61%. Comparing base (d3f8e88) to head (73bc4fd).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #796      +/-   ##
==========================================
- Coverage   72.63%   72.61%   -0.03%     
==========================================
  Files          18       18              
  Lines        3706     3706              
==========================================
- Hits         2692     2691       -1     
- Misses       1014     1015       +1     

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