museca: add Start and 10KEY lights (#296)

## Link to GitHub Issue, if one exists
Fixes #295 

## Description of change
Add missing `Start` and `10KEY` lights output, as see in the test menu.

## Compiling
👍 

## Testing
Seems fine in museca test mode.

src/spice2x/games/museca/io.h

@@ -46,6 +46,8 @@ namespace games::museca {
     // all lights in correct order
     namespace Lights {
         enum {
+            Start,
+            Keypad,
             TitleR,
             TitleG,
             TitleB,