This reverts commit d5f93eb4,
SvxFontHeightItem::SetProp was used to override "dummy" 100% nProp/ePropUnit
values that did not match the computed nHeight value with nProp/ePropUnit values
that are supposed to match the computed nHeight value.  Yuck.

Change-Id: Ic12e824054b3c5da7aca766b9b3eb076d1837d9a