Return renderer state from pop()

[aryashi100]

Addresses a renderer contract mismatch noted in code comments.

Changes:

• Updated p5.Renderer.pop() to return the restored renderer style after state restoration.
• Aligns implementation with comments in p5.Renderer2D.js that describe the expected renderer contract.
• Note: While running the test suite locally, one existing documentation test for loadFont (example Rhino test #4) failed. This appears unrelated to the renderer change and was present prior to this modification.

Screenshots of the change:
N/A (code-only change)

PR Checklist

• npm run lint passes
• Inline reference is included / updated (not applicable)
• Unit tests are included / updated (not applicable)

[perminder-17]

Hi, thanks for the PR. Actually the work of pop() is to not to return anything but to restore the previous state. So, the code doesn't needs any return, bcz caller is not gonna use that returned value, instead can cause confusions.

[aryashi100]

Thanks for the clarification @perminder-17 !
The pop() implementation has been updated to only restore the previous state and no longer returns any value.