Remove border from ghost button styles

Author: mekarpeles

static/css/components/buttonGhost.less

@@ -2,7 +2,6 @@ a {
   &.ghost-btn {
     padding: 0.2rem 0.4rem;
     border-radius: 5px;
-    border: 1px solid @mid-grey;
     font-weight: 500;
     text-decoration: none;
     text-align: center;