swpagerelsize: fix RelativeWidthRelation UNO API

Code was missing to handle the case when properties are set before the
frame is attached.

Change-Id: I22389a8a162cb37b365b7655e048b1ece9774813
swpagerelsize: fix typo in SwFlyFrm::CalcRel()

Change-Id: Ie371919e67261cdc021fc5487b35cc45f7f4105e
swpagerelsize: fix RelativeHeightRelation UNO API

Change-Id: I0c1969785d7e6a0e9082f628d9c490123f287000