Entering incorrect password when editing resets content/throws away changes

[flamion]

Describe the bug
When editing a password protected paste the frontend throws away the changes when entering an incorrect password.
To Reproduce
Steps to reproduce the behavior:

1. Create password protected paste
2. Edit the paste content
3. Enter incorrect password
4. New content is gone

Expected behavior
An error "Incorrect Password" is shown but the changes aren't lost

Desktop (please complete the following information):

• OS: Linux
• Browser Chrome, FireFox