64px Avatar Size Not Enforced in the Toolbar

[trepmal]

If a custom avatar default is defined, and a user without their own Gravatar is logged in, the custom default is shown in all its glory (not resized) in the My Account menu of the Toolbar.

Though there are width and height attributes, the CSS supersedes that with

#wpadminbar * {
	height: auto;
	width: auto;
}

making the custom avatar show at its normal size.

Since the dimensions are also in the class, it's easy to target that image with CSS and force the correct size.

targeting .avatar-64 (reupped)

#19539