cam: options: Don't implement move semantics for OptionsParser::Options

The compiler creates a move constructor automatically when none is
supplied, and it does the right thing by default in this case. Using
std::move() inside the function prevents the compiler from doing
return value optimization and actually hinders performances. Using
std::move() in the caller is unnecessary, the move constructor is used
automatically by the compiler.

For all these reasons remove the tentative optimization that resulted in
worse performances and worse code.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

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