scripted-diff: refactor: CWallet::LoadWallet->PopulateWalletFromDB

There are too many functions in CWallet with names like "Load" and
"Create", disambiguate what CWallet::LoadWallet does by renaming it to
PopulateWalletFromDB.

-BEGIN VERIFY SCRIPT-
sed -i 's|\bLoadWallet()|PopulateWalletFromDB()|g' $(git grep -l 'LoadWallet()' -- ':(exclude)src/wallet/walletdb.cpp')
-END VERIFY SCRIPT-

src/wallet/test/wallet_tests.cpp

@@ -306,7 +306,7 @@ void TestLoadWallet(const std::string& name, DatabaseFormat format, std::functio
     std::vector<bilingual_str> warnings;
     auto database{MakeWalletDatabase(name, options, status, error)};
     auto wallet{std::make_shared<CWallet>(chain.get(), "", std::move(database))};
-    BOOST_CHECK_EQUAL(wallet->LoadWallet(), DBErrors::LOAD_OK);
+    BOOST_CHECK_EQUAL(wallet->PopulateWalletFromDB(), DBErrors::LOAD_OK);
     WITH_LOCK(wallet->cs_wallet, f(wallet));
 }