Check confirm del button active before clicking.

[vaibhavhrt]

Before clicking the confirm delete button check if its active or not, if not remove the class disabling it before clicking.

[vaibhavhrt]

If the tab is not in focus github will not remove the disabled attribute from confirm delete button. Therefore script removes disabled attr from the button before clicking for situations where user might move away from that tab.
Done in commit f93e328