fpspreadsheet: More robust evaluation of xf style attributes but the OOXML reader (check "applyXXXX" against "<>'0'" instead of "='1'")

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3459 8e941d3f-bd1b-0410-a28a-d453659cc2b4