Fixed incorrect bytes order in RGB565 decoder

[Lukas0025]

Bytes order of RGB565 is incorrect in function thats convert RGB565 to RGB888. This is reason for weird colors on image created from this code.

      camera_fb_t *fb = esp_camera_fb_get();

      auto psImageBuf =  (uint8_t*)ps_malloc(fb->width * fb->height * 2);

      //convert JPG to RGB565
      jpg2rgb565(fb->buf, fb->len, psImageBuf, JPG_SCALE_NONE);

      //convert back to JPG
      size_t len;
      uint8_t *data;
      fmt2jpg(psImageBuf, fb->width * fb->height * 2, fb->width, fb->height,  PIXFORMAT_RGB565, 30, &data, &len);

[github-actions]

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