Override methods in NonPersistedEventEntry

This will prevent redactions to entries fetched from hs showing "message
is being redacted" and will instead show "message is redacted"

src/matrix/room/timeline/entries/NonPersistedEventEntry.js

@@ -31,4 +31,14 @@ export class NonPersistedEventEntry extends EventEntry {
     get isNonPersisted() {
         return true;
     }
+
+    // overridden here because we reuse addLocalRelation() for updating this entry
+    // we don't want the RedactedTile created using this entry to ever show "is being redacted"
+    get isRedacting() {
+        return false;
+    }
+
+    get isRedacted() {
+        return !!this._pendingRedactions;
+    }
 }