Fix: Update Developer Tools icon to tool

[hbhalodia]

What?

Closes #995

Why?

• Need to update the icon to give more context to user about inherited settings.

How?

• PR updates to use tool icon from here - https://wordpress.github.io/gutenberg/?path=/story/icons-icon--library&args=filter:tool

Use of AI Tools

• None

Testing Instructions

Screenshots or screencast

Before	After

Changelog Entry

Changed - Update Settings vertical ellipsis icon to tool icon.

[github-actions]

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Co-authored-by: hbhalodia <hbhalodia@git.wordpress.org>
Co-authored-by: jeffpaul <jeffpaul@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.55%. Comparing base (f3765a3) to head (64d2b3b).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #1001   +/-   ##
==========================================
  Coverage      75.55%   75.55%           
  Complexity      3381     3381           
==========================================
  Files            138      138           
  Lines          13081    13081           
==========================================
  Hits            9883     9883           
  Misses          3198     3198           

Flag	Coverage Δ
unit	75.55% <ø> (ø)

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