tree-wide: clang-format CTxMemPool references

[META] Do this so that we can more easily grep for all actual instances
       of CTxMemPool construction.

src/net_processing.cpp

@@ -4628,7 +4628,7 @@ void PeerManagerImpl::MaybeSendFeefilter(CNode& pto, Peer& peer, std::chrono::mi
 namespace {
 class CompareInvMempoolOrder
 {
-    CTxMemPool *mp;
+    CTxMemPool* mp;
     bool m_wtxid_relay;
 public:
     explicit CompareInvMempoolOrder(CTxMemPool *_mempool, bool use_wtxid)