Add strike-out price to LMS Course Home sidebar

lms/static/sass/features/_course-upgrade-message.scss

@@ -30,9 +30,12 @@ Search for the courseware_verified_certificate_upsell promotion ID.
 }
 
 .section-upgrade .upgrade-container {
+  margin-top: 15px;
+}
+
+.section-upgrade.no-discount .upgrade-container {
   float: right;
   text-align: center;
-  margin-top: 15px;
 }
 
 @media only screen and (max-width: 991px) and (min-width: 768px)  {
@@ -45,6 +48,10 @@ Search for the courseware_verified_certificate_upsell promotion ID.
   margin: 0.5em 0;
 }
 
+.section.section-upgrade.discount p {
+  display: inline-block;
+}
+
 .section-upgrade .btn-brand.btn-upgrade {
   color: white !important;
 }