Account for Store disk client quota when bandwidth-limiting the server.

Account for Store disk client quota when bandwidth-limiting the server.

It is not clear why the store client type matters when
MemObject::mostBytesAllowed() is trying to find the maximum delay pool
quota for reading from the next hop HTTP server.  Whether the client(s)
are reading from disk or RAM, the corresponding server-side bandwidth
ought to be limited.

This code was removed as a part of bug 3462 investigation, but it is not
needed to fix bug 3462.