Fix: max buffer stored too long

Refs: #4

src/main/esp32_eurorack_generic.c

@@ -104,7 +104,7 @@ static void adc_cont_init(void)
 
   /* Create continuous mode driver handle */
   adc_continuous_handle_cfg_t adc_handle_config = {
-    .max_store_buf_size = 1024,
+    .max_store_buf_size = ADC_READ_LEN,
     .conv_frame_size = ADC_READ_LEN
   };
   ESP_ERROR_CHECK(adc_continuous_new_handle(&adc_handle_config, &adc_handle));