BufferStored could be larger than BufferCap after _setBufferCap()

Judge @jack-the-pug has assessed the second item in QA Report 64 as Medium risk. The relevant finding follows: Impact In RateLimited.sol BufferCap should be the upper bound of BufferStored, However in setBufferCap it calls updateBufferStored before replacing the old BufferCap. If old BufferCap is...