Fix duplicate "Settings saved" notice on settings page

[aslamdoctor]

What?

Closes
#128

Fix duplicate settings notice by specifying option group in settings_errors()

Why?

While changing and saving any changes on AI Experiments page under admin, it was showing the success message as "Settings saved." twice. This PR fixes it to appear only once.

How?

Specified option group under settings_error() method as below

settings_errors('ai_experiments');

Testing Instructions

1. Go to "Admin > Settings > AI Experiments" Page
2. Change / Don't change any settings on this page
3. Click "Save Changes"

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

[github-actions]

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Co-authored-by: jeffpaul <[email protected]>
Co-authored-by: aslamdoctor <[email protected]>
Co-authored-by: mindctrl <[email protected]>
Co-authored-by: dkotter <[email protected]>

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 27.33%. Comparing base (8cc94c8) to head (0345649).
⚠️ Report is 20 commits behind head on develop.

Files with missing lines	Patch %	Lines
includes/Settings/Settings_Page.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #130   +/-   ##
==========================================
  Coverage      27.33%   27.33%           
  Complexity       152      152           
==========================================
  Files             14       14           
  Lines            900      900           
==========================================
  Hits             246      246           
  Misses           654      654           

Flag	Coverage Δ
unit	27.33% <0.00%> (ø)

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[mindctrl]

Works as expected.

[dkotter]

This is my mistake coming out of #100. Originally I was using this to display errors logged using add_settings_error but then removed that as it wasn't needed, but forgot to remove this. We could just remove this line for now but I'm also fine leaving this in case we do have settings errors we want to display in the future