Fix sed invocations in Start_readahead()

Quoting is good, but in this precise case, we want expansion to create
different command lines arguments!

config/chroot_local-includes/lib/live/config/0000-readahead

@@ -24,18 +24,18 @@ Readahead ()
 
 Start_readahead ()
 {
-	FG_FILES="sed -n '\:$BACKGROUND_AT:q;p' '$READAHEAD_LIST'"
-	BG_FILES="sed -n '\:$BACKGROUND_AT:,\$p' '$READAHEAD_LIST'"
+	FG_FILES="sed -n -e \\:$BACKGROUND_AT:q;p $READAHEAD_LIST"
+	BG_FILES="sed -n -e \\:$BACKGROUND_AT:,\$p $READAHEAD_LIST"
 	FG_SIZE=$(
 	 cd /
-	 "$FG_FILES" |
+	 $FG_FILES |
 	 xargs du -c 2>/dev/null |
 	 awk '$2 ~ /^total$/ { t = t + $1 } END { print t }')
 	(cd /
-	 "$BG_FILES" |
+	 $BG_FILES |
 	 xargs stat >/dev/null 2>/dev/null || :)
 	(cd /
-	 "$FG_FILES" |
+	 $FG_FILES |
 	 xargs cat 2>/dev/null |
 	 pv -f -s ${FG_SIZE}k >/dev/null || :)
 	(cd /