Fixing CD-ROM functions and statusbar

fixed ejecting CD-ROM function: modified unchecking function's order before 'cdrom_null_open(id, 0);';
fixed reloading CD-ROM function: added 'prev_image_path' for reloading previous CD-ROM image.

src/cdrom.h

@@ -162,6 +162,7 @@ typedef struct {
 	uint32_t cdrom_capacity;
 	int image_inited;
 	wchar_t image_path[1024];
+	wchar_t prev_image_path[1024];
 	FILE* image;
 	int image_changed;