Fix QtDesigner in virtualenv in Windows

Quotes are not needed and actually break it even when applied individually to each path.

Since everythiung is included 'absolute' (epyq.widgets.---) the root must also be included in the %PYTHONPATH%.

Ref T141

venv.py

@@ -200,9 +200,9 @@ def setup(path):
     if sys.platform == 'win32':
         with open(os.path.join(mydir, 'activate.bat'), 'w') as f:
             activate = activate.replace('\\', '/')
-            f.write('set PYQTDESIGNERPATH="{root}\epyq;{root}\epyq\widgets"\n'
+            f.write('set PYQTDESIGNERPATH={root}\epyq;{root}\epyq\widgets\n'
                     .format(root=mydir))
-            f.write('set PYTHONPATH="{root}\epyq;{root}\epyq\widgets"\n'
+            f.write('set PYTHONPATH={root};{root}\epyq;{root}\epyq\widgets\n'
                     .format(root=mydir))
             f.write('{}\n'.format(activate))