add offset to LH.return_tips96

Author: rickwierenga

pylabrobot/liquid_handling/liquid_handler.py

@@ -1515,7 +1515,12 @@ def _get_96_head_origin_tip_rack(self) -> Optional[TipRack]:
         raise RuntimeError("All tips must be from the same tip rack")
     return tip_rack
 
-  async def return_tips96(self, allow_nonzero_volume: bool = False, offset: Coordinate = Coordinate.zero(), **backend_kwargs):
+  async def return_tips96(
+    self,
+    allow_nonzero_volume: bool = False,
+    offset: Coordinate = Coordinate.zero(),
+    **backend_kwargs,
+  ):
     """Return the tips on the 96 head to the tip rack where they were picked up.
 
     Examples: