CA-388210: delete comment about deadlock bug, they are fixed

Signed-off-by: Edwin Török <[email protected]>

Author: edwintorok

ocaml/xapi-storage-script/main.ml

@@ -1791,8 +1791,6 @@ let rec diff a b =
   | a :: aa ->
       if List.mem a b then diff aa b else a :: diff aa b
 
-(* default false due to bugs in SMAPIv3 plugins,
-   once they are fixed this should be set to true *)
 let concurrent = ref true
 
 type reload = All | Files of string list | Nothing