[FIX] Check Flatpick dependency only in package.json

[dansysanalyst]

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Motivation

• [X] Bug fix
• [ ] Enhancement
• [ ] New feature
• [ ] Breaking change

Description

This Pull Request removes the verification for flatpicker in resources/js/app.js and tailwind.config.jsas projects might not even use Tailwind. From now on, it searches package.json for "flatpicker" (with quotes).

Alternatively, I've considered removing this check if it is too inconvenient for users.

Related Issue(s): https://github.com/Power-Components/livewire-powergrid/issues/1437

Documentation

This PR requires Documentation update?

• [ ] Yes
• [X] No
• [ ] I have already submitted a Documentation pull request.

[luanfreitasdev]

Thank you @dansysanalyst !