bsdinstall: fix ps3 regression

b6644f5 introduces FREEBSD_BOOTLABEL="FreeBSD" as default value
but cc42ef5 removed this line, expecting it to be set by update_uefi_bootentry()

But ps3 don't use this function so its broken completely.

So we add this line back.

Signed-off-by: Chattrapat Sangmanee <[email protected]>

Author: aomsin2526

usr.sbin/bsdinstall/scripts/bootconfig

@@ -29,6 +29,7 @@
 
 BSDCFG_SHARE="/usr/share/bsdconfig"
 . $BSDCFG_SHARE/common.subr || exit 1
+FREEBSD_BOOTLABEL=$OSNAME
 f_dprintf "%s: loading_includes..." "$0"
 f_include $BSDCFG_SHARE/dialog.subr