edx.org: revises course register button background for all cases (verified,…

edx.org: revises course register button background for all cases (verified, riught column, and bottom of page)

lms/static/sass/_shame.scss

@@ -131,7 +131,7 @@
 
 // edx.org marketing site - registration iframe band-aid (poor form enough to isolate out)
 .view-partial-mktgregister {
-  background: #f0efef !important;
+  background: transparent !important;
 
   // dimensions needed for course about page on marketing site
   .wrapper-view {