Set readOnly to 'nocursor' in markdown editor

Using 'nocursor' when readOnly is true, ensures the blinking caret is hidden avoiding confusion if editing or not.

Author: isaachilly

lib/public/components/common/markdown/markdown.js

@@ -165,7 +165,7 @@ const markdownFromTextarea = (textarea, readOnly, size) => {
 
     const editor = hyperMD.fromTextArea(textarea, {
         hmdModeLoader: '/assets/SmartEditor/codemirror',
-        readOnly,
+        readOnly: readOnly ? 'nocursor' : false,
         lineNumbers: !readOnly,
         extraKeys: {
             'Ctrl-Space': 'autocomplete',