Remove unused last_frame_timestamp_metadata

Author: C-Achard

dlclivegui/cameras/base.py

@@ -124,11 +124,6 @@ def actual_pixel_format(self) -> str | None:
     def recommended_preserve_mono(self) -> bool | None:
         return None
 
-    @property
-    def last_frame_timestamp_metadata(self) -> FrameTimestampMetadata | None:
-        """Return backend-provided timestamp metadata for the last read frame."""
-        return None
-
     @classmethod
     def options_key(cls) -> str:
         """Return the key used to store this backend's options in CameraSettings."""