Removed erroneous std::move on a const Variant.
Removed erroneous std::move on a const Variant.

I'm surprised it even compiles, moves are supposed to be non-const.

PiperOrigin-RevId: 247354164

firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk,firebase/firebase-cpp-sdk