lxc.conf: s/QEMU/LXC/

There's one copy paste error where a comment mentions QEMU
instead of LXC driver.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/lxc/lxc.conf

@@ -15,7 +15,7 @@
 
 # The default security driver is SELinux. If SELinux is disabled
 # on the host, then the security driver will automatically disable
-# itself. If you wish to disable QEMU SELinux security driver while
+# itself. If you wish to disable LXC SELinux security driver while
 # leaving SELinux enabled for the host in general, then set this
 # to 'none' instead.
 #