docs: update forge create-electron-app template to match tutorial

[alicelovescake]

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• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:
This PR:

• Make minor edits to forge starter template to match Electron tutorial:
• Uses app.whenReady().then(...) instead of app.on('ready', ...) to better handle edge cases
• Moves activate listener inside existing whenReady callback as outlined in the docs so that it only happens after app is initialized
• Add node prefix with path module in import to support current best practice.

[dsanders11]

Since you're touching this file anyway, could you also change line 2 to be const path = require('node:path') like in https://github.com/electron/electron-quick-start/blob/main/main.js?

[alicelovescake]

Since you're touching this file anyway, could you also change line 2 to be const path = require('node:path') like in https://github.com/electron/electron-quick-start/blob/main/main.js?

Thanks for the heads up! Updated the file. Let me know if you see anything else! Appreciate your taking a look at my PR :)