ci: fix windows

.github/workflows/release.yml

@@ -42,6 +42,7 @@ jobs:
           go build -tags nosqlite -ldflags="-w -s" -buildmode=c-shared -o ui/flutter/windows/libgopeed.dll github.com/monkeyWie/gopeed/bind/desktop
           cd ui/flutter
           flutter build windows
+          cd build/windows
           $mingw = "C:\ProgramData\Chocolatey\lib\mingw\tools\install\mingw64\bin\"
           $release = "build\windows\runner\Release\"
           cp $mingw\libstdc++-6.dll $release