util: Remove designator initializer from ScheduleBatchPriority
util: Remove designator initializer from ScheduleBatchPriority

Although no compiler appears to complain about it, these are
not valid for c++11.
(http://en.cppreference.com/w/cpp/language/aggregate_initialization says they're c++20)

The structure is defined as:

   struct sched_param {
       int sched_priority;
   };

So passing 0 for the first field has the same effect.

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