bootctl: properly skip duplicate entries (#4048)

'continue' is a fancy no-op here – it only skips through the inner loop,
not the outer one, so entries already in BootOrder get printed twice.

This partially reverts f939cff715 "bootctl: various coding style
updates".

src/boot/bootctl.c

@@ -439,9 +439,12 @@ static int status_variables(void) {
 
                 for (j = 0; j < n_order; j++)
                         if (options[i] == order[j])
-                                continue;
+                                goto next_option;
 
                 print_efi_option(options[i], false);
+
+        next_option:
+                continue;
         }
 
         return 0;