fix syntax

app.py

@@ -105,7 +105,7 @@ neighbors = neighbors.merge(
     right = node_info,
     left_on = "gene_id_1",
     right_on = "gene_id",
-    suffixes = c("", "_1"))
+    suffixes = ("", "_1"))
 
 neighbors = neighbors.merge(
     right = node_info,