Remove unused template param defaults in LockFreeRingBuffer
Remove unused template param defaults in LockFreeRingBuffer

Summary: [Folly] Remove unused template param defaults in `LockFreeRingBuffer`.

Differential Revision: D13113827

fbshipit-source-id: 9400853cde60b8bc227383b2a0ab1efb95786d87

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly