Update run_standalone_backup.bat

Remove unnecessary comment, change other comment about Python version

installation_and_upgrade/run_standalone_backup.bat

@@ -4,7 +4,6 @@ set "SOURCE=\\isis.cclrc.ac.uk\inst$\Kits$\CompGroup\ICP\Releases"
 call "%~dp0\define_latest_genie_python.bat"
 call cd "%~dp0"
 set PYTHONPATH=.
-@REM Needs to be run from installation_and_upgrade directory for modules to work
-@REM Might want to use Python in Instruments/
+@REM Uses Python from the Shares, set as LATEST_PYTHON
 call "%LATEST_PYTHON%" "%~dp0ibex_install_utils\tasks\backup_tasks.py"
 endlocal