DERBY-6183 rlliso2multi and rlliso3multi failing with [WARNING 01004: Data truncation] 

Removed casts from lock_table2 view, which was only used in a few
places.  I was not able to reproduce, but assumption is that a
system background lock when running full suite sometimes triggered
a problem with the cast.  




git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1469445 13f79535-47bb-0310-9956-ffa450edef68