Fix image anchoring for page>=2 when flow-with-text was enabled.

Related discussion at http://mail.kde.org/pipermail/calligra-devel/2011-November/003060.html
Thanks to Boemann for the pointer.

This fixes at least image-anchoring in following documents;
* biology.uco.edu%2FPersonalPages%2FCButler%2FBIO4734%2Fhandouts%2FOrnithology_Syllabus_2%301%30.docx
* classjump.com%2Fmrscarteratclassjump%2Fdocuments%2F6268684551.docx
* commonsenseeconomics.com%2Fwp-content%2Fuploads%2F2%301%30%2F%307%2FDemand-and-Supply-CSE-2%301%30.docx
* diplomabusiness2%301%30.wikispaces.com%2Ffile%2Fview%2Fletter+of+fundraising+cupcakes.docx
* docs.globaltext.terry.uga.edu%3A8%3095%2Fanonymous%2Fwebdav%2FInformation%20Systems%2FIS%20Book%20Version%202%2FSection1%2FISChapter%301.odt
* ice.usq.edu.au%2Finstructions%2Ftemplates%2Ftoolbars_and_templates.odt
* kbenglish.wikispaces.com%2Ffile%2Fview%2FYear+of+Wonders+scroll.docx
* lilt.ilstu.edu%2Fjpda%2FJRSA%2Fcrime%2Fbjs-%20jrsa%20handout2%20HIGH%20DENSITY.docx
* miha.ef.uni-lj.si%2F_dokumenti%2Fwp%2Fgovernment-knowledge-wp_final.doc
* ourladys.pbworks.com%2Ff%2FHouse+of+the+Vettii.docx
* readingroom.ypla.gov.uk%2Fypla%2Fe-bulletin_issue_9_october_13_final_1.doc
* starlighteducation.com%2Ffiles%2FCharts%20and%20Graphs%20in%20Excel%202%30%307.docx
* stats911.com%2Fexam1%2Fnotes.docx
* web.jhu.edu%2Freslife%2Fparents%2FAre%20You%20a%20Helicopter%20Parent.docx
* wiki.services.openoffice.org%2Fw%2Fimages%2Fe%2Fe6%2F%303%304CG-ChartsAndGraphs.odt
* www2.hull.ac.uk%2Fadministration%2Fdocs%2F%304%20Excel_Graphs%26Charts.docx
* www2.hull.ac.uk%2Fadministration%2Fdocs%2F%304%20SPSS%20Charts.docx
* www.bayviewcampersassociation.com%2Fresources%2FSeptember+3.docx
* ...