Fix typo in import that may have been breaking API docs

Fix typo: "griddedd" -> "gridded". This could be the reason the CI
checks were failing mysteriously while building the docs.

compass/landice/tests/greenland/mesh.py

@@ -8,7 +8,7 @@
     clean_up_after_interp,
     interp_gridded2mali,
     make_region_masks,
-    preprocess_griddedd_data,
+    preprocess_gridded_data,
 )
 from compass.model import make_graph_file
 from compass.step import Step
@@ -86,7 +86,7 @@ def run(self):
         # Preprocess the gridded GrIS source datasets to work
         # with the rest of the workflow
         logger.info('calling preprocess_gridded_data')
-        preprocessed_gridded_dataset = preprocess_griddedd_data(
+        preprocessed_gridded_dataset = preprocess_gridded_data(
             self, source_gridded_dataset_1km, floodMask)
 
         # Now build the base mesh and perform the standard interpolation