wallet: Create IsDatabaseLoaded function

Author: ken2812221

src/wallet/db.cpp

@@ -80,8 +80,7 @@ bool IsWalletLoaded(const fs::path& wallet_path)
     LOCK(cs_db);
     auto env = g_dbenvs.find(env_directory.string());
     if (env == g_dbenvs.end()) return false;
-    auto db = env->second.m_databases.find(database_filename);
-    return db != env->second.m_databases.end();
+    return env->second.IsDatabaseLoaded(database_filename);
 }
 
 BerkeleyEnvironment* GetWalletEnv(const fs::path& wallet_path, std::string& database_filename)

src/wallet/db.h

@@ -56,6 +56,7 @@ class BerkeleyEnvironment
     void MakeMock();
     bool IsMock() const { return fMockDb; }
     bool IsInitialized() const { return fDbEnvInit; }
+    bool IsDatabaseLoaded(const std::string& db_filename) const { return m_databases.find(db_filename) != m_databases.end(); }
     fs::path Directory() const { return strPath; }
 
     /**