Cleanup and fix a few compiler warnings

app/src/main/java/exh/debug/DebugToggles.kt

@@ -1,6 +1,7 @@
 package exh.debug
 
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import uy.kohesive.injekt.injectLazy
 
 enum class DebugToggles(val default: Boolean) {
@@ -17,6 +18,7 @@ enum class DebugToggles(val default: Boolean) {
 
     val prefKey = "eh_debug_toggle_${name.toLowerCase()}"
 
+    @OptIn(ExperimentalCoroutinesApi::class)
     var enabled: Boolean
         get() = prefs.flowPrefs.getBoolean(prefKey, default).get()
         set(value) {