Replace deprecated Box with proper one

examples/todoapp/common/main/src/commonMain/kotlin/example/todo/common/main/integration/TodoMainImpl.kt

@@ -1,8 +1,8 @@
 package example.todo.common.main.integration
 
-import androidx.compose.foundation.Box
 import androidx.compose.foundation.Text
 import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer