Fix/coupon scrolling

[adborbas]

Closes WOOMOB-70

Description

The "Create Coupon" view did not dismiss the keyboard when the user scrolled if a field was focused. This resulted in a broken scroll behaviour on navigating back and forth from sheets.

This PR resolves the above issue by adding the .scrollDismissesKeyboard(.immediately) to the view's main ScrollView. I've also added the behaviour to the "Usage Restrictions" view.

Steps to reproduce

1. Open the "Create coupon" sheet for any discount type.
2. Tap into "Amount".
3. Note that the keyboard is presented. You don't have to type anything.
4. Scroll the view.
5. Note that the keyboard is dismissed, and you can scroll the entire view.
6. Open "Usage Restrictions".
7. Tap into any input field.
8. Note that the keyboard is presented. You don't have to type anything.
9. Scroll the view.
10. Note that the keyboard is dismissed, and you can scroll the entire view.

Testing information

Tested and confirmed with the simulator.

Screenshots

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr16218-0192577
	Version	23.4
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	0192577
	Installation URL	34cpcl7b4dolg

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[itsmeichigo]

Thanks for the fix, this works as described