change background color for searchbar in contacts screen

not the best solution. Needs to be improved with theming of Compose.

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/contacts/SearchComponent.kt

@@ -37,7 +37,7 @@ fun DisplaySearch(text: String, onTextChange: (String) -> Unit, contactsViewMode
         modifier = Modifier
             .fillMaxWidth()
             .height(60.dp)
-            .background(color = colorResource(id = R.color.grey_600)),
+            .background(color = colorResource(id = R.color.appbar)),
         value = text,
         onValueChange = { onTextChange(it) },
         placeholder = {