Mouse should only disappear when the game captures it

[PianoMastR64]

Currently, when mouse_support="true", the mouse disappears when the window isn't focused and if the mouse hovers over any part of the game window including the decorations like the title bar and resize handles. I noticed you have to click on the inside where the game is for it to capture the mouse and not let it escape. This should be the only circumstance where the mouse is hidden.