Added block super into dahsboard body class blocks

## Added block super into dashboard body class blocks

I was modifying the dashboard for another project that uses arabic language and rtl direction and I was looking to add a body class in the dashboard layout, something like bidi-ltr and bidi-rtl so I could use this make any dashboard style changes for languages right to left. But there are other classes added to different dashboard templates. So I have added {{ block.super }} into dashboard templates that contain {% block body_class %}

**Related pull request for direction RTL**
https://github.com/tangentlabs/magrudys-matjaro/pull/88

**Notes**
On a related note with these dashboard body classes -- at one point some of these classes help distinguish where the current section of the dashboard you were in. Am not sure this is working -- so maybe these excess ones should be removed?