BBB logo image url input not cleared correctly (AdminSettings)

[Sabr1n4W]

Describe the bug
When typing some text inside the bbb logo image url input on the AdminSettings page and manually deleting the text again (without using the shown delete button) the input is not reset correctly.
This results in an errror message when trying to save the settings.

To Reproduce
Steps to reproduce the behavior:

1. Type some text inside the bbb logo image url input or load settings with some text inside the bbb logo image url input
2. Manually delete the text without using the shown delete button
3. Try to save changes
4. Error message is shown that indicated that the logo must be a string

Expected behavior
Clear the bbb logo image url input correctly so that the settings can be saved without error

Screenshots

Additional context
Clearing the bbb logo image url input with the delete button that is shown when typing in some text works correctly.