0xE0E0E0 is the correct format for Lua hexadecimal values.
However, in the most recent version of the script, you don't need to edit the script file to change the color of the text that is displayed in the MIDI editor -- instead, just right-click on the Inspector in the MIDI editor, and go to "Font settings" in the context menu. (The same dialog should also pop up when you first run the new version.)
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