Waverly: better slider names

Slider names were misleading.
First slider: fade speed (low values means longer hold times)
Second slider: signal gain (i.e. amplification)

wled00/FX.cpp

@@ -6686,7 +6686,7 @@ uint16_t mode_2DWaverly(void) {
 
   return FRAMETIME;
 } // mode_2DWaverly()
-static const char _data_FX_MODE_2DWAVERLY[] PROGMEM = "Waverly ☾@Amplification,Sensitivity,,,,No Clouds,Sound Pressure,AGC debug;;!;2v;ix=64,si=0"; // Beatsin
+static const char _data_FX_MODE_2DWAVERLY[] PROGMEM = "Waverly ☾@Fade Rate,Amplification,,,,No Clouds,Sound Pressure,AGC debug;;!;2v;ix=64,si=0"; // Beatsin
 
 #endif // WLED_DISABLE_2D