Fix bootstrap.bat is not recognized

* Fix `bootstrap.bat is not recognized` if webui library does not exist

Author: hassandraga

PyPI/Package/src/webui/webui.py

@@ -357,10 +357,12 @@ def run_cmd(command):
 
 def _download_library():
     script = 'sh bootstrap.sh'
+    cd = 'cd '
     if platform.system() == 'Windows':
         script = 'bootstrap.bat'
+        cd = 'cd /d '
     # Run: `cd {folder} && bootstrap.sh minimal`
-    run_cmd('cd ' + _get_current_folder() + 
+    run_cmd(cd + _get_current_folder() + 
                ' && ' + script + ' minimal')