Fix timeout command in nuxeoctl.bat

  drive-tests.start-windows:
 [INFO]      [echo] Execute pending actions before start
 [INFO]      [exec] Found NUXEO_CONF = C:\Jenkins\workspace\Drive_FT-drive_master-CUACR5UOIAO62W7K2CAAQ7UISS5UUL3SF5V2PSVOUZC4CRBQLRIA\sources\ftest\target-winslave\tomcat\bin\nuxeo.conf
 [INFO]      [exec] Found JAVA_HOME = C:\Progra~1\Java/jdk-11
 [INFO]      [exec] Using JAVA = C:\Progra~1\Java/jdk-11\bin\java.exe
 [INFO]      [exec] Nuxeo requires Java JDK 1.8.0+ (detected 11.ea.24)
 [INFO]      [exec] timeout: invalid time interval '/t'
 [INFO]      [exec] Try 'timeout --help' for more information.
 [ERROR]

drive-tests.stop-windows:
 [INFO]      [exec] Found NUXEO_CONF = C:\Jenkins\workspace\Drive_FT-drive_master-CUACR5UOIAO62W7K2CAAQ7UISS5UUL3SF5V2PSVOUZC4CRBQLRIA\sources\ftest\target-winslave\tomcat\bin\nuxeo.conf
 [INFO]      [exec] Found JAVA_HOME = C:\Progra~1\Java/jdk-11
 [INFO]      [exec] Using JAVA = C:\Progra~1\Java/jdk-11\bin\java.exe
 [INFO]      [exec] Nuxeo requires Java JDK 1.8.0+ (detected 11.ea.24)
 [INFO]      [exec] timeout: invalid time interval '/t'
 [INFO]      [exec] Try 'timeout --help' for more information.
 [ERROR]      [exec] Result: 1