Fix duplicate viewBox attribute in question mark icon

Author: radwo

app/views/administrate/application/_icons.html.erb

@@ -13,7 +13,7 @@
     <polyline points="18 15 12 9 6 15"></polyline>
   </symbol>
 
-  <symbol id="icon-question-mark" viewBox="0 0 24 24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <symbol id="icon-question-mark" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
     <circle cx="12" cy="12" r="10"></circle>
     <path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"></path>
     <line x1="12" y1="17" x2="12.01" y2="17"></line>