Fix call controls flickering when starting a video call.

Co-authored-by: Greyson Parrelli <greyson@signal.org>

app/src/main/java/org/thoughtcrime/securesms/components/webrtc/v2/CallControls.kt

@@ -216,6 +216,16 @@ data class CallControlsState(
   val startCallButtonText: Int = R.string.WebRtcCallView__start_call,
   val displayEndCallButton: Boolean = false
 ) {
+
+  val hasAnyControls: Boolean
+    get() = displayAudioOutputToggle ||
+      displayVideoToggle ||
+      displayMicToggle ||
+      displayGroupRingingToggle ||
+      displayAdditionalActions ||
+      displayStartCallButton ||
+      displayEndCallButton
+
   companion object {
     /**
      * Presentation-level method to build out the controls state from legacy objects.

app/src/main/java/org/thoughtcrime/securesms/components/webrtc/v2/CallScreen.kt

@@ -180,11 +180,12 @@ fun CallScreen(
     val maxOffset = maxHeight - maxSheetHeight
 
     var peekHeight by remember { mutableFloatStateOf(88f) }
+    val effectivePeekHeight = if (callControlsState.hasAnyControls) peekHeight else 0f
 
     BottomSheetScaffold(
       scaffoldState = callScreenController.scaffoldState,
       sheetDragHandle = null,
-      sheetPeekHeight = peekHeight.dp,
+      sheetPeekHeight = effectivePeekHeight.dp,
       sheetContainerColor = SignalTheme.colors.colorSurface1,
       containerColor = Color.Black,
       sheetMaxWidth = CallScreenMetrics.SheetMaxWidth,

app/src/main/java/org/thoughtcrime/securesms/components/webrtc/v2/WebRtcCallViewModel.kt

@@ -22,6 +22,7 @@ import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.filter
 import kotlinx.coroutines.flow.flatMapLatest
 import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onStart
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
@@ -174,6 +175,7 @@ class WebRtcCallViewModel : ViewModel() {
           0
         }
       }
+      .onStart { emit(0) }
 
     return combine(
       callParticipantsState,