Allow lower values for touch threshold

wled00/cfg.cpp

@@ -296,7 +296,7 @@ bool deserializeConfig(JsonObject doc, bool fromFS) {
           #ifdef SOC_TOUCH_VERSION_2    // ESP32 S2 and S3 have a function to check touch state but need to attach an interrupt to do so
           else
           {
-            touchAttachInterrupt(btnPin[s], touchButtonISR, 256 + (touchThreshold << 4)); // threshold on Touch V2 is much higher (1500 is a value given by Espressif example, I measured changes of over 5000)
+            touchAttachInterrupt(btnPin[s], touchButtonISR, touchThreshold << 4); // threshold on Touch V2 is much higher (1500 is a value given by Espressif example, I measured changes of over 5000)
           }
           #endif
         }