Remove export of no longer existing package

Signed-off-by: Ravi Nadahar <nadahar@rediffmail.com>

Author: Ravi Nadahar

bundles/org.openhab.core.model.script/bnd.bnd

@@ -5,7 +5,6 @@ Export-Package: org.openhab.core.model.script,\
  org.openhab.core.model.script.engine.action,\
  org.openhab.core.model.script.extension,\
  org.openhab.core.model.script.formatting,\
- org.openhab.core.model.script.helper,\
  org.openhab.core.model.script.interpreter,\
  org.openhab.core.model.script.jvmmodel,\
  org.openhab.core.model.script.lib,\