Fix name of RI_MOUSE_LEFT_BUTTON_DOWN containing S at the end

core/sys/windows/user32.odin

@@ -553,7 +553,7 @@ MOUSE_ATTRIBUTES_CHANGED :: 0x04
 MOUSE_MOVE_NOCOALESCE :: 0x08
 
 RI_MOUSE_BUTTON_1_DOWN :: 0x0001
-RI_MOUSE_LEFT_BUTTON_DOWNS :: RI_MOUSE_BUTTON_1_DOWN
+RI_MOUSE_LEFT_BUTTON_DOWN :: RI_MOUSE_BUTTON_1_DOWN
 RI_MOUSE_BUTTON_1_UP :: 0x0002
 RI_MOUSE_LEFT_BUTTON_UP :: RI_MOUSE_BUTTON_1_UP
 RI_MOUSE_BUTTON_2_DOWN :: 0x0004