Fix XYZ grid state.end leak on invalid axis values in xyz_grid_on

Same except-path as the previous commit: jobid is begun before the
try block but never ended on the error return, mirroring the
xyz_grid.py fix.

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/xyz_grid_on.py

@@ -268,6 +268,7 @@ class XYZGridScript(scripts_manager.Script):
             log.error(f"XYZ grid: invalid axis values {e}")
             errors.display(e, 'xyz')
             active = False
+            shared.state.end(jobid)
             return None
 
         Image.MAX_IMAGE_PIXELS = None # disable check in Pillow and rely on check below to allow large custom image sizes