[QOL] Candy Upgrade Notification Rework

[josericardo-fo]

What are the changes?

Remake of #2808 Reworked the Candy Upgrade Notification logic to take account of the new "Buy Egg" option.

Why am I doing these changes?

A new mechanic was implemented (Buying Eggs).

What did change?

The logic of the 'On' setting.

Screenshots/Videos

Before (Look at Spearow)

After

How to test the changes?

Test if the candy icon appears whenever you can buy eggs.

Checklist

• [X] There is no overlap with another PR?
• [X] The PR is self-contained and cannot be split into smaller PRs?
• [X] Have I provided a clear explanation of the changes?
• [X] Have I tested the changes (manually)?
  • [X] Are all unit tests still passing? (npm run test)
• [X] Are the changes visual?
  • [X] Have I provided screenshots/videos of the changes?