scripted-diff: Replace MilliSleep with UninterruptibleSleep

This is safe because MilliSleep is never executed in a boost::thread,
the only type of thread that is interruptible.

* The RPC server uses std::thread
* The wallet is either executed in an RPC thread or the main thread
* bitcoin-cli, benchmarks and tests are only one thread (the main thread)

-BEGIN VERIFY SCRIPT-
sed -i --regexp-extended -e 's/MilliSleep\((\S+)\);/UninterruptibleSleep(std::chrono::milliseconds{\1});/g' $(git grep -l MilliSleep)
-END VERIFY SCRIPT-

src/bitcoind.cpp

@@ -29,7 +29,7 @@ static void WaitForShutdown(NodeContext& node)
 {
     while (!ShutdownRequested())
     {
-        MilliSleep(200);
+        UninterruptibleSleep(std::chrono::milliseconds{200});
     }
     Interrupt(node);
 }