#103 unnecessary def class

template/css/default.less

@@ -19,10 +19,6 @@
 .bx-def-margin-neg { 
     .margin(-@bx-margin);
 }
-.bx-def-margin-neg-leftright { 
-    .margin-left(-@bx-margin);
-    .margin-right(-@bx-margin);
-}
 .bx-def-margin-rightbottomleft {
     .margin-right(@bx-margin);
     .margin-bottom(@bx-margin);

template/profile_switch_row.html

@@ -1,6 +1,6 @@
 <bx_repeat:row>
 
-<div class="sys-profile-switch-row bx-def-margin-neg-leftright bx-def-padding-leftright bx-def-padding-sec-topbottom __class__">
+<div class="sys-profile-switch-row bx-def-margin-leftright-neg bx-def-padding-leftright bx-def-padding-sec-topbottom __class__">
     <div class="sys-profile-switch-row-control bx-def-margin-right">
         <bx_if:active>
             <i class="sys-icon check-square-o"></i>