Unmaintained Question Threads Improvement 2023-04-19

Adding conditional statement to prevent the second notice to be displayed when question no received reply.

CSS adjustments:

• Removed notice border
• Removed link to the solution in the second notice

Added a new note to the OP when an answer is marked as a solution to indicate that they have the possibility to change or cancel their initial choice. The note has a button that points to the marked answer.

The notice is no longer displayed when the action permission to question is set to Paused or No.