ui: eelo: distinguish b/w custom servers based on /e/ and others

Custom/Self-hosted based servers like pure NextCloud based and others do not have
mail server hosting sevices and syncing for their mail servers crashes the mail
application so distinguish and turn off syncs for them unlike /e/ based
custom servers which also implements a corresponding mail server with it.

Also, fix indentation for files.

Signed-off-by: Sumit Pundir <pundirsumit11@gmail.com>
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