Fixes bug where send button is enabled after sending a comment (#2158)

Author: Huddie

Classes/Issues/IssuesViewController.swift

@@ -599,6 +599,7 @@ final class IssuesViewController:
         // get text before calling super b/c it will clear it
         let text = messageView.text
         messageView.text = ""
+        actions?.sendButtonEnabled = false
 
         if let id = resultID {
             addCommentClient.addComment(