fix dbpath for windows

src/core/database.cpp

@@ -18,7 +18,7 @@ Database::Database()
 #if defined(__linux__) || defined(__APPLE__)
     fs::path dbpath = fs::path(std::getenv("HOME")) / ".local/share/kima2";
 #elif defined(_WIN64) || defined(_WIN32)
-    fs::path dbpath = fs::path(std::getenv("LOCALAPPDATA") / "/kima2";
+    fs::path dbpath = fs::path(std::getenv("LOCALAPPDATA")) / "kima2";
 #else
     throw std::runtime_error("Platform not supported.");
 #endif