Bug 31028: (follow-up) Fix notices whitespace

Bug 31028: (follow-up) Fix notices whitespace

We we're using [% %] rather than [%- -%] in our the notice template
introduced with this patchset.  This leads to some interesting rendering
results in some email clients.  Using the proper whitespace ignoring
template markup fixes the situation.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Helen Oliver <HOliver@tavi-port.ac.uk>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>