busybox: do not install udhcpc default.script

It's also installed by netifd (and we probably want to use the openwrt
version instead of the busy box version).

Signed-off-by: Theodore A. Roth <theodore_roth@trimble.com>

recipes-tweaks/busybox/busybox_%.bbappend

@@ -4,3 +4,7 @@ SRC_URI += "\
     file://fragment-lock.cfg \
     file://220-add_lock_util.patch \
 "
+
+do_install_append () {
+    rm -f ${D}/usr/share/udhcpc/default.script
+}