set default image num to 4

settings.py

@@ -4,8 +4,8 @@ import numpy as np
 
 DEFAULT_MODEL_ID = os.getenv("DEFAULT_MODEL_ID", "runwayml/stable-diffusion-v1-5")
 
-MAX_NUM_IMAGES = int(os.getenv("MAX_NUM_IMAGES", "3"))
-DEFAULT_NUM_IMAGES = min(MAX_NUM_IMAGES, int(os.getenv("DEFAULT_NUM_IMAGES", "3")))
+MAX_NUM_IMAGES = int(os.getenv("MAX_NUM_IMAGES", "4"))
+DEFAULT_NUM_IMAGES = min(MAX_NUM_IMAGES, int(os.getenv("DEFAULT_NUM_IMAGES", "4")))
 MAX_IMAGE_RESOLUTION = int(os.getenv("MAX_IMAGE_RESOLUTION", "768"))
 DEFAULT_IMAGE_RESOLUTION = min(MAX_IMAGE_RESOLUTION, int(os.getenv("DEFAULT_IMAGE_RESOLUTION", "768")))