Duplicates 'Current category' text in edit question form

Setup

• Create a course.
• Create a new question category inside the course:
  • Go to Actions menu > More.
  • Click on Question bank > Categories.
  • In the "Add category" section fill in "Name" with the value "New category".
  • Click on the "Add category" button.

Testing instructions:

1. Create a question in question bank under the new category:
   • Click the "Questions" tab.
   • Click on the "Create a new question ..." button.
   • Select "True/False".
   • Fill the "Question name" and "Question text" fields with any values.
   • Click on the "Save changes" button.
2. Edit the new question.
3. Confirm the text "Current category" is not duplicated.