remove duplicate container directive

first directive is overwritten by second one, have tested that 2nd is correct! :)

modules/local/fetch_gbif_metadata.nf

@@ -3,9 +3,7 @@ process FETCH_GBIF_METADATA {
     label 'process_single'
 
     conda "conda-forge::python=3.9.1"
-    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
-        'https://depot.galaxyproject.org/singularity/python:3.9--1' :
-        'quay.io/biocontainers/python:3.9--1' }"
+
     container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
         'https://depot.galaxyproject.org/singularity/mulled-v2-5cada6dc649cb78fe4ccd00b84f9dc4ee50dd363:506b314b4875ac1041355eb6ab70f2d7f87c528c-0' :
         'quay.io/biocontainers/mulled-v2-5cada6dc649cb78fe4ccd00b84f9dc4ee50dd363:506b314b4875ac1041355eb6ab70f2d7f87c528c-0' }"