revert last tried pending event status to waiting when offline

so we don't fail the check if we can immediately remove when redacting

src/matrix/room/sending/PendingEvent.js

@@ -88,6 +88,11 @@ export class PendingEvent {
         this._emitUpdate("status");
     }
 
+    setWaiting() {
+        this._status = SendStatus.Waiting;
+        this._emitUpdate("status");
+    }
+
     get status() { return this._status; }
     get error() { return this._error; }
 

src/matrix/room/sending/SendQueue.js

@@ -74,6 +74,7 @@ export class SendQueue {
                             if (err instanceof ConnectionError) {
                                 this._offline = true;
                                 log.set("offline", true);
+                                pendingEvent.setWaiting();
                             } else {
                                 log.catch(err);
                                 pendingEvent.setError(err);