When a notices is marked as HTML, we need to use block elements
(p, div, li, etc.) or explicit line breaks.
This adds the line breaks where required.
To test:
WELCOME
* Without patch
* Make sure your Koha can send email (set up SMTP server, KohaAdminLibraryAddress)
* Make sure your patron has an email set
* In patron account, use "More > Welcome email"
* Verify all text is on one line
* Apply patch
* reset_all to install new sample notice templates
* Repeat test, verify welcome notice is now nice
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