pgAdmin 4 commit: Remove some more references of Backgrid and Backform.

Remove some more references of Backgrid and Backform.

refs #6134

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=76a6feb2e74623056ff06855baf45dac9f5a4ea8
Author: Khushboo Vashi <khushboo.vashi@enterprisedb.com>

Modified Files
--------------
web/pgadmin/dashboard/static/css/dashboard.css     | 40 ----------------------
web/pgadmin/static/scss/_pgadmin.style.scss        | 13 -------
.../grant_wizard/static/scss/_grant_wizard.scss    |  5 ---
3 files changed, 58 deletions(-)