fix typo in comment about using 128 bins for float data

Author: p-j-smith

src/napari_matplotlib/histogram.py

@@ -31,7 +31,7 @@ def _get_bins(data: npt.NDArray[Any]) -> npt.NDArray[Any]:
         step = np.ceil(np.ptp(data) / 100)
         return np.arange(np.min(data), np.max(data) + step, step)
     else:
-        # For other data types, just have 128 evenly spaced bins
+        # For other data types, just have 99 evenly spaced bins
         return np.linspace(np.min(data), np.max(data), 100)