khal: improve module (#4088)

* khal: Do not hard code globbing.

modules/programs/khal-calendar-accounts.nix

@@ -8,7 +8,7 @@ with lib;
       type = types.nullOr (types.enum [ "calendar" "discover" ]);
       default = null;
       description = ''
-        There is no description of this option.
+        Either a single calendar (calendar which is the default) or a directory with multiple calendars (discover).
       '';
     };
 

modules/programs/khal.nix

@@ -29,7 +29,6 @@ let
       "path = ${
         value.local.path + "/"
         + (optionalString (value.khal.type == "discover") value.khal.glob)
-        + "/*"
       }"
     ] ++ optional (value.khal.readOnly) "readonly = True" ++ [
       (toKeyValueIfDefined (getAttrs [ "type" "color" "priority" ] value.khal))