Cleanup: Drop unused GUI learnRelatedScripts method

This commit does not change behavior.

Author: achow101

src/interfaces/wallet.cpp

@@ -180,7 +180,6 @@ class WalletImpl : public Wallet
         }
         return result;
     }
-    void learnRelatedScripts(const CPubKey& key, OutputType type) override { m_wallet->GetLegacyScriptPubKeyMan()->LearnRelatedScripts(key, type); }
     bool addDestData(const CTxDestination& dest, const std::string& key, const std::string& value) override
     {
         LOCK(m_wallet->cs_wallet);

src/interfaces/wallet.h

@@ -108,10 +108,6 @@ class Wallet
     //! Get wallet address list.
     virtual std::vector<WalletAddress> getAddresses() = 0;
 
-    //! Add scripts to key store so old so software versions opening the wallet
-    //! database can detect payments to newer address types.
-    virtual void learnRelatedScripts(const CPubKey& key, OutputType type) = 0;
-
     //! Add dest data.
     virtual bool addDestData(const CTxDestination& dest, const std::string& key, const std::string& value) = 0;