Remove useless mapRequest tracking that just effects Qt display.

I thought we had removed this a long time ago, TBH, its really
confusing feedback to users that we display whether a tx was
broadcast to immediate neighbor nodes, given that has little
indication of whether the tx propagated very far.

src/net_processing.cpp

@@ -1264,9 +1264,6 @@ void static ProcessGetData(CNode* pfrom, const CChainParams& chainparams, CConnm
             if (!push) {
                 vNotFound.push_back(inv);
             }
-
-            // Track requests for our stuff.
-            GetMainSignals().Inventory(inv.hash);
         }
     } // release cs_main
 
@@ -1965,9 +1962,6 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
                     pfrom->AskFor(inv);
                 }
             }
-
-            // Track requests for our stuff
-            GetMainSignals().Inventory(inv.hash);
         }
     }