fixes whitespace

lms/templates/dashboard.html

@@ -77,7 +77,7 @@
 
   <section class="profile-sidebar">
     <header class="profile">
-      <h2><span class="sr">${_("Username")}: </span><span  class="user-name">${ user.username }</span></h2>
+      <h2><span class="sr">${_("Username")}: </span><span class="user-name">${ user.username }</span></h2>
     </header>
     <section class="user-info">
       <ul>