[flexiglass] Removes unused layoutWidth.

Fix: 329095589
Test: ran Flexiglass on device with a media item and it didn't crash
Flag: ACONFIG com.android.systemui.scene_container DEVELOPMENT
Change-Id: I756e559e007886dc7de6df1918225646f8cee1cf
diff --git a/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt b/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt
index 51464d0..31201c2f 100644
--- a/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt
+++ b/packages/SystemUI/compose/features/src/com/android/systemui/shade/ui/composable/ShadeScene.kt
@@ -373,7 +373,6 @@
 ) {
     if (viewModel.isMediaVisible()) {
         val density = LocalDensity.current
-        val layoutWidth = remember { mutableStateOf(0) }
         val mediaHeight = dimensionResource(R.dimen.qs_media_session_height_expanded)
 
         MediaCarousel(
@@ -389,7 +388,7 @@
                     layout(placeable.width, placeable.height) { placeable.placeRelative(0, 0) }
                 },
             mediaHost = mediaHost,
-            layoutWidth = layoutWidth.value,
+            layoutWidth = 0,
             layoutHeight = with(density) { mediaHeight.toPx() }.toInt(),
             carouselController = mediaCarouselController,
         )