Interceptor Demo update 2022-03-13 (minor/bugfix)

Minor patch. A pair of bugs slipped past me while I was testing.

Update 2022-03-13:

• Fixed a bug where pressing Start didn't restart the level and the only option was to press B to reset the game.
• Fixed a bug where the background palette was changing unpredictably when loading a level.
  • It should now default to a white background on all devices except for the Super Game Boy 1 and 2.
• Upon receiving feedback, the Menu option on the title screen has been renamed to Options.
• Added text to the game over screens saying that you can press B to reset.

EDIT: There is a known bug where the game fails to load properly if you use the game's soft-reset (pressing B from a defeat screen) while playing it on a PAL SNES and SGB. This may be a bug with GBDK-2020 itself. I don't have a quick way to test this as I do not own PAL hardware.