LMS: resolves styling issues for button UI in verification flows

lms/static/sass/multicourse/_dashboard.scss

@@ -537,7 +537,7 @@
       background: $verified-color-lvl5;
 
       .action-upgrade {
-        @extend %btn-verify-primary;
+        @extend %btn-primary-green;
         @include clearfix();
 
         span {

lms/static/sass/views/_verification.scss

@@ -269,12 +269,16 @@
   // elements - controls
   .action-primary {
     @extend %btn-primary-blue;
-    border: none;
+    // needed for override due to .register a:link styling
+    border: 0 !important;
+    color: $white !important;
   }
 
   .action-confirm {
     @extend %btn-verify-primary;
-    border: none;
+    // needed for override due to .register a:link styling
+    border: 0 !important;
+    color: $white !important;
   }
 
   // ====================