Add default icon to OAuth apps
When MySQL runs in strict mode, it doesn't seem possible to add a new OAuth app.
This is because:
* The 'icon' field has no defaults and also has NOT NULL constraint.
* GS uploads/sets the icon[1] (if provided) after the SQL insert[2]
The easiest fix seemed to be to provide a default icon value.
This change sets the default to the "blue peg" default avatar from the base theme.
[1]
7f30e61402/actions/newapplication.php (L176)
[2]
7f30e61402/actions/newapplication.php (L186)
See merge request !29