Corrected bug so that asking for entities in imported does not return all in world

[francescalb]

Description

Asking for entities in imported used ot return everything in world, this is obviously not correct if there are more ontologies in world or if we are asking for entities in one of the imported ontologies.

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

Merging #655 (fcd9e94) into master (047d9af) will increase coverage by 0.42%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #655      +/-   ##
==========================================
+ Coverage   68.85%   69.28%   +0.42%     
==========================================
  Files          16       16              
  Lines        3301     3324      +23     
==========================================
+ Hits         2273     2303      +30     
+ Misses       1028     1021       -7     

Files Changed	Coverage Δ
ontopy/patch.py	59.86% <ø> (ø)
ontopy/ontology.py	77.86% <100.00%> (+1.68%)	⬆️

[jesper-friis]

Good fix. Added a comment