fix: correct indentation after else in /inpaint-multipart (line ~343)

api/main.py

@@ -340,7 +340,7 @@ def inpaint_multipart(
         log.info("Successfully created binary mask: %d pink pixels → white (255), %d pixels → black (0)",
                  nonzero, binmask.shape[0] * binmask.shape[1] - nonzero)
     else:
-    mask_rgba = _load_rgba_mask_from_image(m)
+        mask_rgba = _load_rgba_mask_from_image(m)
 
     # When mask_is_painted=true, we encode pink as alpha=0, so process_inpaint's default invert_mask=True works correctly
     actual_invert = invert_mask  # Use default True for painted masks