Small Fixes: Add message about the password not being saved + Remove description from the etebase package

Fix 1: Some early users were confused about the password field being empty in "Calendar Properties" (config dialog). The properties dialog now shows a message about EteSync not storing the password.

Fix 2: The cmake logs currently show "Etebase, EteSync" in the logs for the Etebase package. This isn't great w.r.t semantics, so it is better to remove the DESCRIPTION tag.