STYLE: Fix formatting of json files

This commit updates the sources files based on the automatic fixes
applied using the "mirrors-prettier" pre-commit hook introduced in
the subsequent commit.

Author: jcfr

cookiecutter.json

@@ -2,10 +2,10 @@
   "project_name": "SlicerCustomAppTemplate",
   "github_organization": "Kitware",
   "github_project": "{{ cookiecutter.project_name }}",
-  "org_domain" : "kitware.com",
-  "org_name" : "Kitware, Inc.",
-  "app_name" : "{{ cookiecutter.project_name }}",
-  "bundle_identifier" : "{{ cookiecutter.org_domain.split('.') | reverse | join('.') }}.{{ cookiecutter.project_name | lower }}",
+  "org_domain": "kitware.com",
+  "org_name": "Kitware, Inc.",
+  "app_name": "{{ cookiecutter.project_name }}",
+  "bundle_identifier": "{{ cookiecutter.org_domain.split('.') | reverse | join('.') }}.{{ cookiecutter.project_name | lower }}",
   "app_version_major": "0",
   "app_version_minor": "1",
   "app_version_patch": "0",