htseq: fix singularity config

src/nf_modules/htseq/htseq.config

@@ -17,6 +17,10 @@ profiles {
     singularity.enabled = true
     process {
       withName: sort_bam {
+        container = "file://bin/samtools:1.7.img"
+        cpus = 1
+      }
+      withName: counting {
         container = "file://bin/htseq:0.11.2.img"
         cpus = 1
       }