tweaked dogear and discussion column styles

lms/static/sass/_discussion.scss

@@ -1027,7 +1027,7 @@ body.discussion {
     float: right;
     @include box-sizing(border-box);
     border: 1px solid #aaa;
-    border-radius: 0 3px 3px 0;
+    border-radius: 3px;
     background: #fff;
     box-shadow: 0 1px 2px rgba(0, 0, 0, .05);
     width: 68%;
@@ -1064,7 +1064,7 @@ body.discussion {
       display: block;
       position: absolute;
       top: -1px;
-      right: -1px;
+      right: -2px;
       width: 52px;
       height: 51px;
       background: url(../images/follow-dog-ear.png) 0 -52px no-repeat;