Use the full name of the 'boot' flag in parted calls

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.713) UNRELEASED; urgency=medium
+
+  * Use the full name of the 'boot' flag in parted calls as it's not good
+    practice to rely on the shortened, ambiguous version.
+
+ -- Łukasz 'sil2100' Zemczak <lukasz.zemczak@ubuntu.com>  Wed, 24 Feb 2021 12:55:37 +0100
+
 livecd-rootfs (2.712) hirsute; urgency=medium
 
   [ Cody Shepherd ]

live-build/ubuntu-cpc/hooks.d/base/disk-image.binary

@@ -50,7 +50,7 @@ create_empty_partition() {
     parted_prefix="parted $disk --script --"
     ${parted_prefix} mkpart primary "$type" "$start" "$end"
     if [ -n "$bootable" ]; then
-        ${parted_prefix} set "$part" B
+        ${parted_prefix} set "$part" boot
     fi
     ${parted_prefix} print
     ${parted_prefix} align-check opt "$part"