recipe: Fix udev patch

The value needs to be quoted, otherwise it does not work.

Change-Id: I3a73f7f56d620cf38260898e272be42c32ae82bc
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1158044
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1158465
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>