dev/core#481 Ensure that Bulk Mailings is a checkbox rather than radi…

[seamuslee001]

…o to allow for users even when only 1 bulk mailing setting to unset bulk mailing

Overview

Allow for users to unset bulk mailing from an email

Before

Bulk Mailing was a radio in non multiple bulk email set

After

Bulk Mailing is now a checkbox so users can unset the Bulk Email setting

ping @pradpnayak @eileenmcnaughton

[civibot]

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[alifrumin]

I tested this and think it is ready to be merged.

How I tested:

I logged into a 5.6 test site and was able to replicate that the Bulk Mailing field on an email for a New Contact is displayed as a radio button and there is no way to un-select it once it is selected see screenshot below:

I then logged into the test site created by Jenkins for this pr. With this pr, the Bulk Mailing field on an email for a New Contact is displayed as a checkbox that can be checked and unchecked:

[eileenmcnaughton]

I'm going to merge this as @pradpnayak logged it, @seamuslee001 worked on it & @alifrumin reviewed it - that means 3 experienced people have considered whether this is a good change to make & 2 have checked it works - for a UI element I think that is appropriate