Remove default values for umi options in schema

Author: drpatelh

nextflow_schema.json

@@ -78,7 +78,6 @@
                 },
                 "umitools_bc_pattern2": {
                     "type": "string",
-                    "default": "None",
                     "fa_icon": "fas fa-barcode",
                     "description": "The UMI barcode pattern to use if the UMI is located in read 2."
                 },
@@ -89,7 +88,6 @@
                 },
                 "umitools_umi_separator": {
                     "type": "string",
-                    "default": "_",
                     "fa_icon": "fas fa-star-half-alt",
                     "description": "The character that separates the UMI in the read name. Most likely a colon if you skipped the extraction with UMI-tools and used other software."
                 },