Fix edit description to require only one click.

Thanks to uusijani and xet7 !

Fixes #3338

client/components/cards/cardDescription.jade

@@ -3,5 +3,5 @@ template(name="descriptionForm")
   .new-description.js-new-description(
     class="{{#if descriptionFormIsOpen}}is-open{{/if}}")
     form.js-new-description-form
-      +editor(class="js-new-description-input" data-meteor-emoji-large="true")
+      +editor(class="js-new-description-input" data-meteor-emoji-large="true" autofocus="autofocus")
         | {{getUnsavedValue 'cardDescription' _id getDescription}}

client/components/main/editor.jade

@@ -3,6 +3,7 @@ template(name="editor")
     dir="auto"
     class="{{class}}"
     id=id
+    autofocus=autofocus
     placeholder="{{_ 'comment-placeholder'}}")
     +Template.contentBlock