Fix case where you assign yourself your own todo

[mickmister]

Summary

Users reported an issue where if you assign yourself to todo that is in your owned todos, the todo would end up in a weird state where you can't access it in either list. This is because it would delete the todo from your list, making it so it's not part of any list.

This PR makes it so it doesn't delete it from your list when you do this.

Ticket Link

Fixes #200

[AayushChaudhary0001]

Tested this PR for the following scenario:-

• Created a ToDo.
• Assigned the Todo to myself

The PR was working fine as the ToDo was getting reflected in the My ToDo list, LGTM. Approved.

[AayushChaudhary0001]

@ayusht2810 Please check this once as some checks are failing for this PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 6.87%. Comparing base (968b119) to head (156c025).
Report is 1 commits behind head on master.

❗ Current head 156c025 differs from pull request most recent head 1a2ceb8. Consider uploading reports for the commit 1a2ceb8 to get more accurate results

Files	Patch %	Lines
server/list.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #203      +/-   ##
=========================================
+ Coverage    6.32%   6.87%   +0.54%     
=========================================
  Files          10      10              
  Lines        1708    1601     -107     
=========================================
+ Hits          108     110       +2     
+ Misses       1592    1483     -109     
  Partials        8       8              

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[mickmister]

@AayushChaudhary0001 CI is fixed now