don't remember login if the encrypion app is enabled because the user
needs to log-in again in order to decrypt his private key with his password
introduce OC_Util::rememberLoginAllowed()
check every enabled app if the remember login feature needs to be disabled
set rememberlogin to false for the encryption app
Merge pull request #4967 from owncloud/dont_remember_login_if_enc_enabled

don't remember login if the encrypion app is enabled