Mantis: remove unused transition script

When coming from the previous stack there are no params anywhere, so
this will not execute anyway.

boards/atl/mantis-edu/init/rc.board_extras

@@ -3,18 +3,3 @@
 tap_esc start -d /dev/ttyS4 -n 4
 sleep 1
 mixer load /dev/tap_esc /etc/mixers/quad_x.main.mix
-
-# Transition from previous non open-source flight stack
-if param compare SYS_AUTOSTART 4001
-then
-	param reset_all
-	tune_control play -t 4
-	sleep 2
-	if bl_update /etc/extras/bootloader.bin
-	then
-		tune_control play -t 3
-	else
-		tune_control play -t 5
-	fi
-	sleep 2
-fi