Remove no longer needed escaping of special characters

The escaping of special characters was needed when the ids of the
permission checkboxes for shares were based on the "shareWith" field.
Since they are based on the "shareId" field the escaping is no longer
needed, as the "sharedId" is expected to always contain compatible
characters.

Signed-off-by: Daniel Calviño Sánchez <danxuliu@gmail.com>