Delete SGUIMessage GUIM_SETTINGS_UPDATED broadcasts redundant with the broadcast initiated from SetSetting from rP141.

rP1540 introduced the call rightfully in ShowTooltip since CTooltip::SetupText() depends on the just changed _mousepos setting.
But then rP1554 moved that _mousepos SetSetting call, resulting in the message becoming redundant; and it inserted the second redundant message in HideTooltip.

These were the only redundant SGUIMessage HandleMessage calls.