Fix bottom sheet title bar background color

ui/src/main/java/de/mm20/launcher2/ui/component/BottomSheetDialog.kt

@@ -5,17 +5,20 @@ import androidx.compose.animation.core.animateDpAsState
 import androidx.compose.foundation.gestures.Orientation
 import androidx.compose.foundation.layout.*
 import androidx.compose.foundation.shape.CornerSize
-import androidx.compose.material.*
+import androidx.compose.material.FixedThreshold
+import androidx.compose.material.FractionalThreshold
+import androidx.compose.material.SwipeableState
+import androidx.compose.material.swipeable
 import androidx.compose.material3.CenterAlignedTopAppBar
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
+import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.*
 import androidx.compose.ui.Alignment
-import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clipToBounds
 import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
 import androidx.compose.ui.input.nestedscroll.NestedScrollSource
 import androidx.compose.ui.input.nestedscroll.nestedScroll
@@ -173,6 +176,9 @@ fun BottomSheetDialog(
                         CenterAlignedTopAppBar(
                             title = title,
                             actions = actions,
+                            colors = TopAppBarDefaults.centerAlignedTopAppBarColors(
+                                containerColor = Color.Transparent,
+                            ),
                         )
                         Box(
                             modifier = Modifier