fix function usage

conf/wustl_htcf.config

@@ -1,6 +1,16 @@
 // Forked from https://github.com/nf-core/configs/blob/master/conf/prince.config
 
-def singularityDir = set_singularity_path()
+def labEnvVar = System.getenv("LAB")
+
+if (labEnvVar) {
+    System.out.println("Lab: " + labEnvVar)
+    singularityDir = "/ref/$LAB/data/singularity_images_nextflow" // If $LAB is set, use that
+} else {
+    def id = "id -nG".execute().text
+    def labAutodetect = id.split(" ").last()
+    System.out.println("Lab: " + labAutodetect)
+    singularityDir = "/ref/" + labAutodetect + "/data/singularity_images_nextflow"
+}
 
 params {
     config_profile_description  = """
@@ -29,15 +39,3 @@ process {
     beforeScript = "exec \$( spack load --sh singularity )"
     executor     = "slurm"
 }
-
-def set_singularity_path() {
-    def labEnvVar = System.getenv("LAB")
-    if (labEnvVar) {
-        System.out.println("Lab: " + labEnvVar)
-        return "/ref/$LAB/data/singularity_images_nextflow" // If $LAB is set, use that
-    }
-    def id = "id -nG".execute().text
-    def labAutodetect = id.split(" ").last()
-    System.out.println("Lab: " + labAutodetect)
-    return "/ref/" + labAutodetect + "/data/singularity_images_nextflow"
-}