Fix Duplicate Queue Name Issue

[Soumit915]

I see the name of the queue changes and becomes capitalised in the pop-up of the qr-code. I think there might be miss-understanding arising with the name of the queue, when there are alike names like 'MyQ1' and 'Myq1'. Even, when the queue remains empty this thing happens. This might lead to confusion to the users as to which queue is the one they are wanting. I have attached the screenshots of the case below.

The above two queues are different but the same name is getting displayed. We should refrain from using duplicate queue-names irrespective of the case of the letters, as mentioned by @maaverik . So, it will be better if check if there arises duplicate queue-name irrespective of the case than just only checking duplicate queue names with case-sensitive. Like in the above example while going to make a queue of name 'Myq1' should not be allowed as there exists a queue name 'MyQ1'

Hope you understand. Please revert back for queries