Update script to create NinjaTrader database folder if it doesn't exist already

ram_disk.bat

@@ -1,15 +1,17 @@
 REM Run as administrator or else the disk will not be formatted.
-
 @echo off
 
 REM Set the desired drive letter and size for the RAM disk.
 SET DriveLetter=R:
 SET Size=10240M
 
-REM Check if the drive is already mounted.
-if exist %DriveLetter% goto End
-
-REM Create the RAM disk.
+REM Create the RAM disk if it doesn't exist.
+if not exist %DriveLetter% (
     imdisk -a -s %Size% -m %DriveLetter% -p "/fs:NTFS /q /y"
+)
 
-:End
+REM Check if the "db" folder exists on the RAM disk and create it if it doesn't.
+REM This is necessary for NinjaTrader to run properly.
+if not exist %DriveLetter%\db\ (
+    mkdir %DriveLetter%\db
+)