Remove duplicated line

nextflow_schema.json

@@ -19,7 +19,6 @@
                     "schema": "assets/schema_input.json",
                     "mimetype": "text/csv",
                     "pattern": "^\\S+\\.csv$",
-                    "schema": "assets/schema_input.json",
                     "description": "Path to comma-separated file containing information about the samples in the experiment.",
                     "help_text": "You will need to create a design file with information about the samples in your experiment before running the pipeline. Use this parameter to specify its location. It has to be a comma-separated file with 3 columns, and a header row. See [usage docs](https://nf-co.re/proteinfold/usage#samplesheet-input).",
                     "fa_icon": "fas fa-file-csv"