Add collection process missing button styles

[Robert Lyon]

This not a problem in 20.10+

But is a problem in 20.04
See attached image

[Mahara Bot (dev-mahara)]

Patch for "20.04_STABLE" branch: https://reviews.mahara.org/11348

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/11348
Committed: https://git.mahara.org/mahara/mahara/commit/c4c8acb531ba665d8c94be1fba6a3dbd063dc66c
Submitter: Robert Lyon (<email address hidden>)
Branch: 20.04_STABLE

commit c4c8acb531ba665d8c94be1fba6a3dbd063dc66c
Author: Robert Lyon <email address hidden>
Date: Thu Oct 8 13:18:51 2020 +1300

Bug 1898955: Collection creation process have correct button styles

Change-Id: Ia8279f236e727e7401dc3746be478cfca5637b1a
Signed-off-by: Robert Lyon <email address hidden>

[Rebecca Blundell (rjb-dev)]

The above patch fixes this instance of the bug, however there are others.

Tested on Ubuntu 18.04
Firefox
Postgres 10.14
PHP 7.4
Raw and Primary School themes
Mahara 20.04_STABLE

Test steps:
1. Create a collection
2. On the 'Edit collection pages' page (collection/views.php) the 'Next: Edit access/ Cancel' button group has incorrect styling.
(It has "btn-primary submitcancel" classes, but is missing "btn" class.)
3. Load a second instance of Mahara with the fix.
Results:
✔ On the collection/views.php page the styling is correct.
✔ Checking the inspect window shows "btn" class is now present.
PASSED.

4. Load 'Primary school' theme.
5. Click on 'Manage' for collection from P&C page.
Results:
✔ Styling is correct.

6. Look for other instances of "btn-primary submitcancel" without "btn" class
7. Check those for incorrect styling.
Results:
More incorrect styling found. See bug #tbc

[Rebecca Blundell (rjb-dev)]

Bug report for other incorrect button styling: https://bugs.launchpad.net/mahara/+bug/1899120