meta-digi-del: remove busybox 1.19 override

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-del/recipes-core/busybox-1.19.4/busybox_1.19.4.bbappend

@@ -1,7 +0,0 @@
-FILESEXTRAPATHS_prepend_del := "${THISDIR}/files:"
-SRC_URI_append_del += "file://defconfig-del"
-PR_append_del = "+${DISTRO}.0"
-
-do_configure_prepend_del () {
-        cp ${WORKDIR}/defconfig-del ${WORKDIR}/defconfig
-}