[positionier] generate_context macro panic with default permissions

[its-monotype]

Default permissions include set-tray-icon-state, but tray-icon is an optional feature, so it's probably causing this error.

error: proc macro panicked
  --> src\lib.rs
   |
76 |         .run(tauri::generate_context!())
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: message: failed to resolve ACL: SetPermissionNotFound { permission: "set-tray-icon-state", set: "default" }