Resolves fdo#81213: Wrong table-clause generated by reportbuilder

Oracle doesn't accept "AS" for making an alias from a table
See https://bugs.freedesktop.org/show_bug.cgi?id=81213#c2
https://bugs.freedesktop.org/show_bug.cgi?id=81213#c4
https://bugs.freedesktop.org/show_bug.cgi?id=81213#c5
for more information

(thank you Lionel)

Change-Id: I33c86d78b2590116d4af46ffd3e54c3c791268ea