Shuffle(sortedProposedBlocks) is also changing the original SortedProposedBlocks[]

[Yashk767]

Describe the bug

We shuffle the sortedProposedBlocks during dispute state so that every staker follows different order when iterating over blocks for dispute.
The Shuffle() function which we are using is also changing the original sortedProposedBlocks array resulting in fetching of wrong blockIndex

for e.g  - 
sortedProposedBlocks= [5,4,2,3,1]

randomSortedProposedBlocks =  Shuffle[sortedProposedBlocks]
randomSortedProposedBlocks = [4,5,1,2,3]

Ideally sortedProposedBlocks should be same i.e [5,4,2,3,1]

But it also changes,
sortedProposedBlocks = [4,5,1,2,3]

it follows sortedProposedBlocks = randomSortedProposedBlocks