fix ambig wccl-run swithces

wccl-apps/wccl-run.cpp

@@ -365,7 +365,7 @@ int main(int argc, char** argv)
 			 "Output in-sentence token counts")
 			("global-counts,g", value(&global_numbering),
 			 "Output global counts")
-			("output-sentence-indices,H", value(&sentence_indices),
+			("output-sentence-indices,S", value(&sentence_indices),
 			 "Output sentence indices")
 			("output-orths,O", value(&output_orths),
 			 "Output token orths")