nextflow.config: remove space in memory declaration

src/nextflow.config

@@ -18,7 +18,7 @@ profiles {
     docker.enabled = true
     process {
       errorStrategy = 'finish'
-      memory = '16 GB'
+      memory = '16GB'
       withLabel: big_mem_mono_cpus {
         cpus = 1
       }
@@ -32,7 +32,7 @@ profiles {
     singularity.cacheDir = "./bin/"
     process {
       errorStrategy = 'finish'
-      memory = '16 GB'
+      memory = '16GB'
       withLabel: big_mem_mono_cpus {
         cpus = 1
       }