Advanced: PlantRepository.tryUpdateRecentPlantsForGrowZoneCache is initially unused

[omaksymov]

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In Advanced Coroutines codelab "start" version of the codebase contains unused tryUpdateRecentPlantsForGrowZoneCache method in PlantRepository. According to Step 12, it is supposed to be used inside PlantListViewModel.setGrowZoneNumber: instead of

    fun setGrowZoneNumber(num: Int) {
//...

        // initial code version, will move during flow rewrite
        launchDataLoad { plantRepository.tryUpdateRecentPlantsCache() }
    }

should be

    fun setGrowZoneNumber(num: Int) {
//...

        // initial code version, will move during flow rewrite
        launchDataLoad { plantRepository.tryUpdateRecentPlantsForGrowZoneCache(GrowZone(num)) }
    }