[FIX] Random data - Fix editor event

[PrimozGodec]

Issue

Random data fail on PyQt6 because of wrong super call in leaveEvent

Description of changes

Call correct super

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bbffe63) 82.92% compared to head (63af3c2) 82.92%.

Files	Patch %	Lines
orangecontrib/educational/widgets/owrandomdata.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #165   +/-   ##
=======================================
  Coverage   82.92%   82.92%           
=======================================
  Files          18       18           
  Lines        3109     3109           
  Branches      364      364           
=======================================
  Hits         2578     2578           
  Misses        478      478           
  Partials       53       53           

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