fix for webui.bat to support python with spaces in names

webui.bat

@@ -27,7 +27,7 @@ if [%VENV_DIR%] == [] goto :skip_venv
 dir %VENV_DIR%\Scripts\Python.exe >tmp/stdout.txt 2>tmp/stderr.txt
 if %ERRORLEVEL% == 0 goto :activate_venv
 
-for /f %%i in ('%PYTHON% -c "import sys; print(sys.executable)"') do set PYTHON_FULLNAME=%%i
+for /f "delims=" %%i in ('CALL %PYTHON% -c "import sys; print(sys.executable)"') do set PYTHON_FULLNAME="%%i"
 echo Creating venv in directory %VENV_DIR% using python %PYTHON_FULLNAME%
 %PYTHON_FULLNAME% -m venv %VENV_DIR% >tmp/stdout.txt 2>tmp/stderr.txt
 if %ERRORLEVEL% == 0 goto :activate_venv