Surface image loading error in Reader (#1981)

(cherry picked from commit fefa8f84982b537ca930438f7976087844d5bb9c)

# Conflicts:
#	CHANGELOG.md
#	app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerPageHolder.kt

source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/model/Page.kt

@@ -54,6 +54,6 @@ open class Page(
         data object LoadPage : State
         data object DownloadImage : State
         data object Ready : State
-        data object Error : State
+        data class Error(val error: Throwable) : State
     }
 }