Before the click on a single file delete icon fired two different handlers - one of them is for multiple deletion only

skip update if the recipient is the same user as the owner, otherwise we run in a infinite loop for group shares

LDAP: user exists check on getHome, otherwise check will be performed with wrong configs on a multi LDAP server setup.

fixed overlap of input controls (root cert import)
see issue: https://github.com/owncloud/apps/issues/767