Add nfsen_base to config_definitions.json (#16065)

* Update config_definitions.json

Added nfsen_base so that nfsen stats feature works.  I had to add as an array as it was the way I was able to make it work, even though another type may make more sense from a user interface perspective.  I put it in order 10 as there seemed to be a gap there, but one could argue that it should be higher and other nfsen items renumbered.

* Update config_definitions.json

Fixed typo

* Update config_definitions.json

* Update settings.php

Added Default NFSen Base Directory

* Update settings.php

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Co-authored-by: Tony Murray <murraytony@gmail.com>

lang/en/settings.php

@@ -1038,6 +1038,10 @@ return [
         'nfsen_lasts' => [
             'description' => 'Default Last Options',
         ],
+        'nfsen_base' => [
+            'description' => 'NFSen Base Directory',
+            'help' => 'Used to locate device specific graphs',
+        ],
         'nfsen_split_char' => [
             'description' => 'Split Char',
             'help' => 'This value tells us what to replace the full stops `.` in the devices hostname with. Usually: `_`',