Make sure to use the right format for coordinates (#331)

* BUG: Make sure to use the right format for coordinates

* MAINT: Use older version of matplotlib to omit pytest errors.

src/darsia/corrections/shape/curvature.py

@@ -807,6 +807,8 @@ def correct_metadata(self, metadata: dict = {}) -> dict:
                     self.config["crop"]["width"],
                 ]
                 meta["dimensions"] = dimensions
-                meta["origin"] = [0, self.config["crop"]["height"]]
+                meta["origin"] = darsia.CoordinateArray(
+                    [0, self.config["crop"]["height"]]
+                )
 
         return meta