Allow use of provided SDL2 in Windows CI

.ci/scripts/windows/docker.sh

@@ -17,8 +17,6 @@ wine cmake.exe .. \
     -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=OFF \
     -DENABLE_QT_TRANSLATION=OFF \
     -DUSE_CCACHE=ON \
-    -DSUYU_USE_BUNDLED_SDL2=OFF \
-    -DSUYU_USE_EXTERNAL_SDL2=OFF \
     -DENABLE_LIBUSB=NO \
     -DSUYU_TESTS=OFF \
     -GNinja