Merge pull request #1678 from nf-core/muffato-patch-1

Single-core tasks shouldn't request more than 1 core

nf_core/pipeline-template/conf/base.config

@@ -27,7 +27,7 @@ process {
     // TODO nf-core: Customise requirements for specific processes.
     // See https://www.nextflow.io/docs/latest/config.html#config-process-selectors
     withLabel:process_single {
-        cpus   = { check_max( 1    * task.attempt, 'cpus'    ) }
+        cpus   = { check_max( 1                  , 'cpus'    ) }
         memory = { check_max( 6.GB * task.attempt, 'memory'  ) }
         time   = { check_max( 4.h  * task.attempt, 'time'    ) }
     }