init: Avoid unnecessarily setting sys.use_memfd to false

The init scripts currenlty sets sys.use_memfd to false. However, this
isn't required, since the only user of the property is libcutils, and
libcutils treats the property not being set as false. Therefore,
remove the call to setprop for sys.use_memfd.

Bug: 421222146
Change-Id: I410b8cfb07bd92ecfdee95ba4a4bb78a50e8b6f9
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com>