`mechlovin/delphine/rgb_led`: reduce size (#24160)

keyboards/mechlovin/delphine/rgb_led/keyboard.json

@@ -23,7 +23,6 @@
             "knight": true,
             "christmas": true,
             "static_gradient": true,
-            "rgb_test": true,
             "alternating": true,
             "twinkle": true
         }
@@ -62,8 +61,6 @@
             "pixel_rain": true,
             "pixel_flow": true,
             "pixel_fractal": true,
-            "typing_heatmap": true,
-            "digital_rain": true,
             "solid_reactive_simple": true,
             "solid_reactive": true,
             "solid_reactive_wide": true,