Incorrect role name HTML escaping in permissions screen tool tips

This is similar to MDL-70320. Our sharp eyed testers spotted that it did not just happen in the visible text, but also in some of the tool tips.

To reproduce:

1. Go to https://qa.moodledemo.net/course/edit.php?id=2 and use Role renaming to change some role names to contain HTML special chars like & < and >.
2. Go to https://qa.moodledemo.net/admin/roles/permissions.php?contextid=25.
3. Hover your mouse over the Delete icons.

Expected result: tool tip says "Delete Reader & Learner role"

Actual result: tool tip says "Delete Reader & amp;amp; Learner role"

HTML source of the icon is:
<i class="icon fa fa-trash fa-fw " title="Delete Reader & amp;amp;amp; Learner role" aria-label="Delete Reader &amp;amp; Learner role"></i>

So, this is being excaped twice more than required!

(Grrr! extra spaced added to stop Jira messing with the entities.)