ignores file format settings for grids

Author: byzod

scripts/prompt_matrix.py

@@ -82,6 +82,6 @@ def run(self, p, put_at_start):
         processed.images.insert(0, grid)
 
         if opts.grid_save:
-            images.save_image(processed.images[0], p.outpath_grids, "prompt_matrix", prompt=original_prompt, seed=processed.seed, grid=True, p=p)
+            images.save_image(processed.images[0], p.outpath_grids, "prompt_matrix", extension=opts.grid_format, prompt=original_prompt, seed=processed.seed, grid=True, p=p)
 
         return processed