samples: drivers: led: led_strip: esp32s3-devkitc led uses GPIO38

Change `GPIO39` to `GPIO38` in overlay.
The esp32s3_devkitc rgb led is connected to GPIO38, not 39.
Tested change on board and verified to function as intended.

Signed-off-by: david burke <[email protected]>

Author: burke-david

samples/drivers/led/led_strip/boards/esp32s3_devkitc_procpu.overlay

@@ -39,7 +39,7 @@ i2s_led: &i2s0 {
 &pinctrl {
 	i2s0_pinconf: i2s0_pinconf {
 		group1 {
-			pinmux = <I2S0_O_SD_GPIO39>;
+			pinmux = <I2S0_O_SD_GPIO38>;
 			output-enable;
 		};
 	};