style: Run cargo fmt across the project

src/config.rs

src/dbus_codegen/mod.rs

src/dbus_codegen/network_manager.rs

src/dbus_codegen/network_manager_access_point.rs

src/dbus_codegen/network_manager_connection_active.rs

src/dbus_codegen/network_manager_device.rs

src/dbus_codegen/network_manager_settings.rs

src/dbus_wrappers/connection.rs

src/dbus_wrappers/connectivity_state.rs

src/dbus_wrappers/device_state.rs

src/dbus_wrappers/manager.rs

src/dbus_wrappers/manager_settings.rs

src/dbus_wrappers/mod.rs

src/dbus_wrappers/signal.rs

src/dbus_wrappers/state.rs

src/device_watcher.rs

src/event.rs

src/identifier.rs

src/watcher.rs