sending messages with a poor connection results in keys not being sent

### Steps to reproduce

1. Have a poor connection (0-1 cellular bars, distant WiFi, etc.) or no connection
2. Send a message
3. Observe that the check mark only appears later when the connection improves

### Outcome

#### What did you expect?

The message *and* decryption keys arrive successfully at the receiving devices.

#### What happened instead?

The message arrives without decryption keys, so other users see the "this could take a while" message. The keys never arrive.

### Your phone model

Pixel 3a

### Operating system version

Android 12

### Application version and app store

Element version 1.5.11 [40105112] (G-40bfffae); Google Play Store

### Homeserver

matrix.kylrth.com

### Will you send logs?

No

### Are you willing to provide a PR?

No