Remove use of IsInitialBlockDownload in wallet code

This commit does not change behavior.

src/interfaces/chain.cpp

@@ -248,6 +248,7 @@ public:
     CAmount maxTxFee() override { return ::maxTxFee; }
     bool getPruneMode() override { return ::fPruneMode; }
     bool p2pEnabled() override { return g_connman != nullptr; }
+    bool isInitialBlockDownload() override { return IsInitialBlockDownload(); }
     int64_t getAdjustedTime() override { return GetAdjustedTime(); }
     void initMessage(const std::string& message) override { ::uiInterface.InitMessage(message); }
     void initWarning(const std::string& message) override { InitWarning(message); }