Address minor build warnings

(cherry picked from commit 431f8772f8ad2f30d71bb6565ec2644e4e56c691)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestorer.kt

presentation-core/build.gradle.kts

@@ -38,7 +38,6 @@ tasks {
     // See https://kotlinlang.org/docs/reference/experimental.html#experimental-status-of-experimental-api(-markers)
     withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
         kotlinOptions.freeCompilerArgs += listOf(
-            "-opt-in=coil.annotation.ExperimentalCoilApi",
             "-opt-in=androidx.compose.foundation.layout.ExperimentalLayoutApi",
             "-opt-in=androidx.compose.material.ExperimentalMaterialApi",
             "-opt-in=androidx.compose.material3.ExperimentalMaterial3Api",
@@ -47,6 +46,8 @@ tasks {
             "-opt-in=androidx.compose.foundation.ExperimentalFoundationApi",
             "-opt-in=androidx.compose.animation.ExperimentalAnimationApi",
             "-opt-in=androidx.compose.animation.graphics.ExperimentalAnimationGraphicsApi",
+            "-opt-in=coil.annotation.ExperimentalCoilApi",
+            "-opt-in=kotlinx.coroutines.FlowPreview",
         )
     }
 }