fix Up 'N' Down reset during title screen (#615)

src/prelaunch/up.n.down.a

@@ -1,5 +1,5 @@
 ;license:MIT
-;(c) 2019 by 4am/Frank M.
+;(c) 2019, 2024 by 4am/Frank M.
 
 !cpu 6502
 !to "build/PRELAUNCH.INDEXED/UD",plain
@@ -7,6 +7,8 @@
 
          !source "src/macros.a"
 
+         inc   $3F4       ; reboot during title screen
+
          lda   #$03       ; reset vector to $103
          sta   $2D4E
          lda   #$01       ; (game uses the 3 value to set STA $'03'F2