Provide both required arguments to move_in_image_coordinates

The integration test checks that moving in image coordinates fails
before the CSM thing is calibrated.
Unfortunately, it is missing the `y` argument, so it would fail either way.

This commit supplies the extra argument so that the failure should come from the right place.

It also changes the expected error to `ServerActionError` and adds a check
for the message, to verify it is due to missing calibration data.

A future version of the LabThings Client (#89) may raise a different
error if a required argument is missing, so fixing this will ensure
that upstream change doesn't break anything here.

tests/integration_tests/test_actions.py

@@ -114,8 +114,14 @@ def test_camera_stage_mapping_calibration(simulation_test_env):
     assert csm.image_to_stage_displacement_matrix is None
     assert csm.last_calibration is None
     # And therefore that actions error
-    with pytest.raises(lt.exceptions.FailedToInvokeActionError):
+    with pytest.raises(
-        csm.move_in_image_coordinates(x=10)
+        lt.exceptions.ServerActionError,
+        match=(
+            r"The camera_stage_mapping calibration is not yet available\. "
+            r"This probably means you need to run the calibration routine\."
+        ),
+    ):
+        csm.move_in_image_coordinates(x=10, y=0)
 
     # Calibrate
     csm.calibrate_xy()