Make sure player controls don't display with odd black space when stacked on smaller screens

[LtBackup]

[natraj-s]

the reason that player 2 controls get stacked below on smaller screens is because we're hiding player 1 controls currently using visibility: hidden while having col-md-6 on both our controls. if we had display:none instead, then both player 1 and player 2 controls would be displayed on the left side and for player 2, wouldn't align with their cannon.