[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

• [X] 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 :warning:

Additional details and impacted files

```diff @@ 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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