SfxItemPool(..., ATTR_STARTINDEX, ATTR_ENDINDEX, aItemInfos, ...) off by one

...since d9ef61fb546af443736057557552e3a95c569c11 "API CHANGE: roll back the
XStyle changes to add a new Hidden property on Style" bumped ATTR_ENDINDEX for
ATTR_HIDDEN but didn't adapt aItemInfos, and mstahl suggests its better to
adapt aItemInfos than to use ATTR_ENDINDEX-1 in the SfxItemPool ctor call.

Change-Id: Iafdf595091ac300793bad1bcd87d58abba4fda6d