(less) Fixing carousel control positioning

The left control should be positioned from the left, while the right
control should be positioning from the right. Positioning both from the
left results in the right carousel control being incorrectly positioned
(most noticeable with a larger than normal font size).

carousel.less

@@ -103,11 +103,18 @@
   .glyphicon-chevron-right {
     position: absolute;
     top: 50%;
-    left: 50%;
     z-index: 5;
     display: inline-block;
   }
   .icon-prev,
+  .glyphicon-chevron-left {
+    left: 50%;
+  }
+  .icon-next,
+  .glyphicon-chevron-right {
+    right: 50%;
+  }
+  .icon-prev,
   .icon-next {
     width:  20px;
     height: 20px;