Add option to hide battery widget if no battery is present

[ranger-ross]

This PR adds a "Hide When No Battery Found" option to Battery section of the Bar configuration.

When its enabled the battery module will be hidden if the battery type is not ASTAL_BATTERY_TYPE_BATTERY. (see available types here).

This option is disabled by default.

Disabled	Enabled

fixes #940

[Jas-SinghFSU]

Couldn't we add

    const isVisible = Variable.derive(
        [bind(batteryService, 'device-type'), bind(hideModuleWhenNoBatteryFound)],
        (deviceType: number, hideModuleWhenNoBatteryFound: boolean) => {
            const isBattery = deviceType === AstalBattery.Type.ASTAL_BATTERY_TYPE_BATTERY;
            return !hideModuleWhenNoBatteryFound || isBattery;
        },
    );

Directly to the isVisible of BatteryLabel (idk why I named it that).

[ranger-ross]

I originally tried that but there were two problems I ran into:

1. It seems isVisible does not respect state changes and needs to be a primative boolean.
2. Even when hardcoding is isVisible to false there is still an empty container that is rendered by the WidgetContainer

I could be incorrect since I've never used this framework but I couldn't get it to work.