package/skeleton-init-systemd: fix "won't" typo in comment

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit eb83f8e09a28e4ca978cb02b20c54e350bd71614)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/skeleton-init-systemd/fakeroot_tmpfiles.sh

@@ -16,7 +16,7 @@
 # such an specifier to prevent leaking host information.
 #
 # shell expansion is critical to be POSIX compliant,
-# this script wont work with zsh in its default mode for example.
+# this script won't work with zsh in its default mode for example.
 #
 # The script takes several measures to handle more complex stuff
 # like passing this correctly: