Fix method rename left out of rebase

Author: juhoinkinen

annif/rest.py

@@ -146,7 +146,7 @@ def _suggest(project_id, documents, parameters):
 
     try:
         hit_filter = SuggestionFilter(project.subjects, limit, threshold)
-        hit_sets = project.suggest_batch(corpus)
+        hit_sets = project.suggest_corpus(corpus)
     except AnnifException as err:
         return server_error(err)