fix: Remove SeaBIOS control characters (#1520)

src/entry.sh

@@ -39,6 +39,8 @@ terminal
 tail -fn +0 "$QEMU_LOG" --pid=$$ 2>/dev/null &
 cat "$QEMU_TERM" 2> /dev/null | tee "$QEMU_PTY" | \
 sed -u -e 's/\x1B\[[=0-9;]*[a-z]//gi' \
+-e 's/\x1B\x63//g' -e 's/\x1B\[[=?]7l//g' \
+-e '/^$/d' -e 's/\x44\x53\x73//g' \
 -e 's/failed to load Boot/skipped Boot/g' \
 -e 's/0): Not Found/0)/g' & wait $! || :