Fix to enabled settings screen in 2.6
add behat test.

changed filepicker to filemanager to support the behat test
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Another issue found by testers. Non managers although they can add the block to their my home page they cannot delete it.
reverting last change, we just need to set the capability for myaddinstance to MANGER
missed the release update
Merge pull request #9 from drjosephbaxter/UoNChanges

2.6 fixes