fix(gui): hide lists with [object Object] in advanced settings (#9743)

As discussed in
https://github.com/syncthing/syncthing/pull/9175#discussion_r1730431703,
entries in advanced settings are unusable if they are comprised of a
list of objects. It just displays `[object Object], [object Object],
[object Object]`, e.g. for the devices a folder is shared with.

Filter out these config elements by detecting an array whose members are
not all strings or numbers, and setting them to `skip` type.

Fix some unnecessary repetition in calling `inputTypeFor()`, since it is
already cached in the `ng-init` directive.

gui/default/syncthing/core/syncthingController.js

@@ -3343,6 +3343,11 @@ angular.module('syncthing.core')
                 return 'checkbox';
             }
             if (value instanceof Array) {
+                if (value.some(function (element) {
+                    return typeof element !== 'number' && typeof element !== 'string';
+                })) {
+                    return 'skip';
+                }
                 return 'list';
             }
             if (typeof value === 'object') {