Remove legacy test rainbow track state

include/app_track_model.hpp

@@ -880,6 +880,8 @@ struct TrackDisplayTestParameters {
 			return "BLINK";
 		case track_app_TrackDisplayTestPattern_TRACK_DISPLAY_TEST_PATTERN_SCAN:
 			return "SCAN";
+		case track_app_TrackDisplayTestPattern_TRACK_DISPLAY_TEST_PATTERN_CONTINUOUS_RAINBOW:
+			return "CONTINUOUS_RAINBOW";
 		}
 		return "UNKNOWN";
 	}

include/track_core/model.hpp

@@ -50,7 +50,6 @@ enum class AccelerationProfile : std::uint8_t {
 enum class TrackState : std::uint8_t {
     stop = 0,
     run = 1,
-    test_rainbow = 2,
     test_display = 4,
 };