Always show "sign out" link in IITCm.

On smartphones, there is no mouse cursor, there hovering something is impossible.

Currently, the signout button is shown when hovering the player name. On mobile, this causes a problem. When you click the area where the signout button would be, it is first handled as a virtual mouseover, causing the button to appear. Then, the click event is applied, which leads to a signout, even though the user clicked an empty area.

This patch removes the JS that shows/hides the button, replacing the functionality with CSS. Also, a smartphone only snippet makes the button always visible.