coverity#705391: xmloff: XMLMergeElemTransformerContext misuse of enum

The enum types XMLElemTransformerAction and XMLAttrTransformerAction
use the same integer values so a mixture of values from these 2 in one
switch is very suspicious.  In the various *ActionTable arrays in
OOo2Oasis/Oasis2OOo there is just one such array that mixes values from
the 2 enums, and that is just the values that coverity complains about.

The XML_ETACTION_EXTRACT_CHARACTERS was added at a later date in commits
8d374c039e7d349141befe3c9ef97f82f42bfa7
2685b93a6a23867baa4df265bb0cc35abaf76c0e
7d2405a54d13f68a35dfc5f619ad4bdb0b761856
c276550e07f8078fe9345985f70e8384d930a83f

...but it turns out that the XMLAttrTransformerAction ones are handled
in StartElement() and ProcessAttrs() methods but the
XMLElemTransformerAction ones are handled in CreateChildContext()
methods so probably the XML_ATACTION_MOVE_FROM_ELEM* values are in
the wrong enum.

Change-Id: Ib1791f6eafac4fb1e99334f41c17a90cfb076359