Make validationinterface.UpdatedBlockTip more verbose

In anticipation of making all the callbacks out of block processing
flow through it. Note that vHashes will always have something in it
since pindexFork != pindexNewTip.

src/main.cpp

@@ -3099,11 +3099,9 @@ bool ActivateBestChain(CValidationState &state, const CChainParams& chainparams,
                         }
                     });
                 }
-                // Notify external listeners about the new tip.
-                if (!vHashes.empty()) {
-                    GetMainSignals().UpdatedBlockTip(pindexNewTip);
-                }
             }
+            // Notify external listeners about the new tip.
+            GetMainSignals().UpdatedBlockTip(pindexNewTip, pindexFork, fInitialDownload);
         }
     } while (pindexNewTip != pindexMostWork);
     CheckBlockIndex(chainparams.GetConsensus());