Update run_standalone_backup.bat

change back to set PYTHONPATH=.

installation_and_upgrade/run_standalone_backup.bat

@@ -2,7 +2,8 @@
 setlocal
 set "SOURCE=\\isis.cclrc.ac.uk\inst$\Kits$\CompGroup\ICP\Releases"
 call "%~dp0\define_latest_genie_python.bat"
-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/
 call "%LATEST_PYTHON%" "%~dp0ibex_install_utils\tasks\backup_tasks.py"
 endlocal