Increase buffer size for generic popup message

The message can contain a filename, so it should be large enough to contain that and the message itself.

src/game/client/components/menus.h

@@ -199,7 +199,7 @@ class CMenus : public CComponent
  NUM_BUTTONS
  };
  char m_aPopupTitle[128];
- char m_aPopupMessage[256];
+ char m_aPopupMessage[IO_MAX_PATH_LENGTH + 256];
  struct
  {
  char m_aLabel[64];