mlvwm: update to 0.9.3

0.9.2 -> 0.9.3
Fix RestartSystem()/Done() to correctly restart into other window managers
Add RoundedScreenCorners configuration
Changed default font size to 12px
Changed default scroll bar width/height to 16px
Changed default menu bar height to 20px
More accurate sizing & styling of window title bars & controls, scroll bars, and resize handle

0.9.1 -> 0.9.2
Change sprintf() & strcat() to snprintf()

(nia)