BP Nouveau: Remove `px` units from image width and height attributes

[mercime]

BP Nouveau's Activity Widget includes avatar of member cited in the blockquote shown below. Image width and height attritubes already return the rendered width and height of the image in CSS pixels by default in all browsers.

Change:

<img src="//www.gravatar.com/avatar/secret?s=40px&amp;r=g&amp;d=blank" class="avatar user-1-avatar avatar-40px photo" width="40px" height="40px" alt="Profile picture of admin">

To

<img src="//www.gravatar.com/avatar/secret?s=40px&amp;r=g&amp;d=blank" class="avatar user-1-avatar avatar-40px photo" width="40" height="40" alt="Profile picture of admin">

Patch coming up.

[mercime]

In 11988:

Nouveau Activity Widget: Remove px units from image width and height attributes.

Fixes #7764.

[hnla]

describing the unit :( tbh I would prefer removing the attr altogether for Nouveau.