Update manage operational layers sample (#175)

Author: ruiqima

manage-operational-layers/src/main/java/com/esri/arcgismaps/sample/manageoperationallayers/components/MapViewModel.kt

@@ -21,6 +21,7 @@ import androidx.compose.runtime.mutableStateListOf
 import androidx.lifecycle.AndroidViewModel
 import com.arcgismaps.mapping.ArcGISMap
 import com.arcgismaps.mapping.BasemapStyle
+import com.arcgismaps.mapping.Viewpoint
 import com.arcgismaps.mapping.layers.ArcGISMapImageLayer
 import com.arcgismaps.mapping.layers.Layer
 import com.esri.arcgismaps.sample.manageoperationallayers.R
@@ -62,6 +63,7 @@ class MapViewModel(
 
         // add the layers to the map's operational layers
         arcGISMap.apply {
+            initialViewpoint = Viewpoint(39.8, -98.6, 5e7)
             operationalLayers.addAll(
                 listOf(
                     imageLayerElevation,

manage-operational-layers/src/main/java/com/esri/arcgismaps/sample/manageoperationallayers/screens/MainScreen.kt

@@ -24,9 +24,7 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
-import com.arcgismaps.mapping.Viewpoint
 import com.arcgismaps.toolkit.geocompose.MapView
-import com.arcgismaps.toolkit.geocompose.MapViewpointOperation
 import com.esri.arcgismaps.sample.manageoperationallayers.components.MapViewModel
 import com.esri.arcgismaps.sample.sampleslib.components.SampleTopAppBar
 
@@ -46,8 +44,7 @@ fun MainScreen(sampleName: String) {
             ) {
                 MapView(
                     modifier = Modifier.fillMaxSize().weight(1f),
-                    arcGISMap = mapViewModel.arcGISMap,
-                    viewpointOperation = MapViewpointOperation.Set(viewpoint = Viewpoint(39.8, -98.6, 5e7))
+                    arcGISMap = mapViewModel.arcGISMap
                 )
                 LayersList(
                     activateLayerNames = mapViewModel.activateLayerNames,