css: don't use monospace font for textareas.

This changes the font in text input boxes (including the tag edit box)
from monospace to Verdana.

app/javascript/src/styles/specific/posts.scss

@@ -535,10 +535,6 @@ div#unapprove-dialog {
   }
 }
 
-textarea[data-autocomplete="tag-edit"] {
-  font-family: monospace;
-}
-
 #add-commentary-dialog {
   input {
     width: 70%;