fix linting

.nf-core.yml

@@ -1,4 +1,6 @@
 repository_type: pipeline
 lint:
+  nextflow_config:
+    - params.plugins_dir
   files_unchanged:
     - assets/sendmail_template.txt

nextflow_schema.json

@@ -23,12 +23,10 @@
                     "type": "string",
                     "fa_icon": "fas fa-images",
                     "help_text": "Use this to specify the location of your input files. For example:\n\n```bash\n--input 'path/to/data/*.mcd'\n```\n\nPlease note the following requirements:\n\n1. The path must be enclosed in quotes\n2. The path must have at least one `*` wildcard character\n\nIf left unspecified, a default pattern is used: `data/*.mcd`",
-                    "description": "Path to input data file(s) (globs must be surrounded with quotes). Currently supported formats are *.mcd, *.ome.tiff, *.txt.",
-                    "default": "data/*.mcd"
+                    "description": "Path to input data file(s) (globs must be surrounded with quotes). Currently supported formats are *.mcd, *.ome.tiff, *.txt."
                 },
                 "metadata": {
                     "type": "string",
-                    "default": "./metadata.csv",
                     "description": "Path to metadata csv file indicating which images to merge in full stack and/or Ilastik stack.",
                     "help_text": "The file should only contain 3 columns i.e. 'metal', 'full_stack' and 'ilastik_stack'. The `metal` column should contain all the metals used in your antibody panel. The `full_stack` and `ilastik_stack` entries should be `1` or `0` to indicate whether to include or exclude a metal for a given stack, respectively. See [`metadata.csv`](https://github.com/nf-core/test-datasets/blob/imcyto/inputs/metadata.csv) for an example.",
                     "fa_icon": "fas fa-file-csv"