fix MERGEKMER inclusion

src/main.nf

@@ -7,7 +7,7 @@ Testing pipeline for marseq scRNASeq analysis
 include { SPLIT } from "./modules/split"
 include { FASTKMERS } from "./modules/fastkmers"
 include { MERGEKMER } from "./modules/mergekmer"
-include { MERGEKMER2 } from "./modules/mergekmer"
+include { MERGEKMER as MERGEKMER2 } from "./modules/mergekmer"
 include { COLLATEKMER } from "./modules/mergekmer"