Improve composite exposes

[Koenkk]

For: Koenkk/zigbee-herdsman-converters#5058 and Koenkk/zigbee-herdsman-converters#5298 (CC: @protyposis, @mdziekon)

• Removes the apply button for nested composites (one apply button on the root composite is always shown now)
• Fix apply button always greyed out for nested composites, apply button on root composite will be enabled when all child composites are filled in
• Used the following expose (requires a small change in zigbee-herdsman-converters, access needs to be added for composite)

exposes.composite('schedule_settings_composite', 'schedule_settings_composite', ea.ALL)
    .withFeature(exposes.composite('Days', 'days')
        .withFeature(exposes.switch().withState('mon', true, undefined, ea.STATE_SET))
        .withFeature(exposes.switch().withState('tue', true, undefined, ea.STATE_SET))
        .withFeature(exposes.switch().withState('wed', true, undefined, ea.STATE_SET))
        .withFeature(exposes.switch().withState('thu', true, undefined, ea.STATE_SET))
        .withFeature(exposes.switch().withState('fri', true, undefined, ea.STATE_SET))
        .withFeature(exposes.switch().withState('sat', true, undefined, ea.STATE_SET))
        .withFeature(exposes.switch().withState('sun', true, undefined, ea.STATE_SET)),
    )
    .withFeature(exposes.composite('Start', 'start')
        .withFeature(exposes.numeric('Hour', ea.STATE_SET).withProperty('hour'))
        .withFeature(exposes.numeric('Minute', ea.STATE_SET).withProperty('minute'))
        .withFeature(exposes.numeric('Temperature', ea.STATE_SET).withProperty('temperature')))
    .withFeature(exposes.composite('Intermediate 1', 'intermediate1')
        .withFeature(exposes.numeric('Hour', ea.STATE_SET).withProperty('hour'))
        .withFeature(exposes.numeric('Minute', ea.STATE_SET).withProperty('minute'))
        .withFeature(exposes.numeric('Temperature', ea.STATE_SET).withProperty('temperature')))
    .withFeature(exposes.composite('Intermediate 2', 'intermediate2')
        .withFeature(exposes.numeric('Hour', ea.STATE_SET).withProperty('hour'))
        .withFeature(exposes.numeric('Minute', ea.STATE_SET).withProperty('minute'))
        .withFeature(exposes.numeric('Temperature', ea.STATE_SET).withProperty('temperature')))
    .withFeature(exposes.composite('End', 'end')
        .withFeature(exposes.numeric('Hour', ea.STATE_SET).withProperty('hour'))
        .withFeature(exposes.numeric('Minute', ea.STATE_SET).withProperty('minute'))
        .withFeature(exposes.numeric('Temperature', ea.STATE_SET).withProperty('temperature')))
    .withDescription('Smart schedule configuration'),

• Example: