[UX] Change "Stop engaging after a conversion?" to a positive statement

[andersonjeccel]

Q	A
Bug fix? (use the a.b branch)	[ ]
New feature/enhancement? (use the a.x branch)	[ ]
Deprecations?	[ ]
BC breaks? (use the c.x branch)	[ ]
Automated tests included?	[ ]
Related user documentation PR URL	mautic/mautic-documentation#...
Related developer documentation PR URL	mautic/developer-documentation#...
Issue(s) addressed	Fixes #...

Description:

When creating a focus item, you have this option to decide whether the item should try again with the same user, at another time, if the user already has converted the first time.
This PR changes the action to a positive question.

Before: Stop engaging after a conversion?
After: Engage again after a conversion?

Steps to test this PR:

1. Open this PR on Gitpod or pull down for testing locally (see docs on testing PRs here)
2. Open Channels > Focus items > New > Builder
3. Select the type "Collect data" and see the new label

[andersonjeccel]

@mallezie @LordRembo
I think this PR needs logic modification too

[LordRembo]

Similarly to another PR, see if you it helps to reverse the data condition in plugins/MauticFocusBundle/Form/Type/PropertiesType.php

'data'  => $options['data']['stop_after_conversion'] ? false : true,

[kuzmany]

@LordRembo @andersonjeccel It needs to create a migration too. Is it worth spending that time on that?

[andersonjeccel]

@kuzmany It's really out of my knowledge area, so if it's complex, I can close this PR