rpn: remove redundant mutex locking in RPN mode/prefix wrappers

RPN.GetMode/SetMode/GetPrefixMode/SetPrefixMode acquired r.mu
before delegating to Operations methods that already acquire
o.mu. Since Operations guards mode and prefixMode with its own
RWMutex, the RPN-level locks were redundant double-locking
on separate mutexes for the same data.

Removed the r.mu locking from these four methods. Thread safety
is preserved by Operations' internal mutex.

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