Update example to place frame buffer in PSRAM (#648)

ESP32 failed to start the example

examples/camera_example/main/take_picture.c

@@ -125,6 +125,7 @@ static camera_config_t camera_config = {
 
     .jpeg_quality = 12, //0-63, for OV series camera sensors, lower number means higher quality
     .fb_count = 1,       //When jpeg mode is used, if fb_count more than one, the driver will work in continuous mode.
+    .fb_location = CAMERA_FB_IN_PSRAM,
     .grab_mode = CAMERA_GRAB_WHEN_EMPTY,
 };