There's an issue with information about how to do that. It says why atlassian changed that and how you can go to the original logo type using css.
Check out here: https://jira.atlassian.com/browse/CONF-28275
This is the answer description:
Changing your logos to squares with CSS
If you really dislike the round logos, and just want them to be square, you can do this with a custom sytlesheet (Confluence Admin > Stylesheet), The CSS snippets to use are below. Note that global custom stylesheets only apply to the globally set theme. If for example you have the default theme set globally, but a few spaces use the doc theme, you'll need to apply the CSS for the Doc theme and the project dialog again in the Space Stylesheet (Browser>Space Admin>Stylesheet). You won't need to customise at the space level for spaces using the global default.
/* Default sidebar */
.acs-side-bar-space-info .avatar-img-container .avatar-img-wrapper,#image-holder .small-logo-container .small-logo-wrapper {border-radius:0;}
/* Space directory, Dashboard space list */
.global.logo, .space.logo {border-radius:0;}
/* Doc Theme header */
.theme-documentation .space-logo .logo {border-radius:0;}
/* Project dialog */
.project-dialog-header-wrapper .project-header img {border-radius:0;}
Hope this helps!
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