[#3355] - Security File principalExpression doesn't work if split across lines

When the value of the <principalExpression> begins on a new line it seems to prevent the filter from being applied.

This doesn't seem to work:

<principalExpression>
authentication.getPrincipal().getRoles().any{ it.getRoleName() in ['ROLE_SUPERMART_MANAGER'] }
</principalExpression>

This works fine
<principalExpression>authentication.getPrincipal().getRoles().any{ it.getRoleName() in ['ROLE_SUPERMART_MANAGER'] }
</principalExpression>