migrate remaining std::aligned_storage_t usage in DistributedMutex

Summary: Migrates `std::aligned_storage_t<48, 8>` to `folly::aligned_storage_t<48, 8>` in `CoalescedTask::storage_` in `DistributedMutex-inl.h`.

Reviewed By: ilvokhin

Differential Revision: D94614056

fbshipit-source-id: 07e1bfd9aabd41b9e170a912c883d918194b6520

Author: yfeldblum

third-party/folly/src/folly/synchronization/DistributedMutex-inl.h

@@ -353,7 +353,7 @@ class Waiter {
     // knowledge of the return type and can apply the appropriate
     // reinterpret_cast and launder operation to safely retrieve the data from
     // this buffer
-    std::aligned_storage_t<48, 8> storage_;
+    folly::aligned_storage_t<48, 8> storage_;
   };
   std::array<std::uint8_t, hardware_destructive_interference_size> padding2;
 };