ProgressButton
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fix partial ring in the progress drawable for the first cycle
The progress drawable's ring is only partially displayed for the first rotation as show in the gif below.
I have fixed the issue, it was caused due to multiple calls to the start() function of the drawable (I was so stupid, it took me 3 hours to figure that out). You can see in the gif below, now the progress drawable behaves normally.

Forgive me if the multiple calls to the start() function is intentional.
@razir Can you please review it ?