Remove unused attributes in sample viewer

Author: mwcraig

src/astro_image_display_api/image_viewer_logic.py

@@ -74,11 +74,6 @@ class ImageViewerLogic:
     state to simulate the behavior of a real viewer.
     """
 
-    _cuts: BaseInterval | tuple[float, float] = AsymmetricPercentileInterval(
-        upper_percentile=95
-    )
-    _stretch: BaseStretch = LinearStretch
-
     # some internal variable for keeping track of viewer state
     _wcs: WCS | None = None
     _center: tuple[numbers.Real, numbers.Real] = (0.0, 0.0)
@@ -189,9 +184,9 @@ def set_cuts(
         **kwargs,  # noqa: ARG002
     ) -> None:
         if isinstance(value, tuple) and len(value) == 2:
-            self._cuts = ManualInterval(value[0], value[1])
+            cuts = ManualInterval(value[0], value[1])
         elif isinstance(value, BaseInterval):
-            self._cuts = value
+            cuts = value
         else:
             raise TypeError(
                 "Cuts must be an Astropy.visualization Interval object or a tuple "
@@ -202,7 +197,7 @@ def set_cuts(
             raise ValueError(
                 f"Image label '{image_label}' not found. Please load an image first."
             )
-        self._images[image_label].cuts = self._cuts
+        self._images[image_label].cuts = cuts
 
     def set_colormap(
         self,