fpspreadsheet: Make ods stringtests test case ignore the string result of the ##0.0E0 format which is designed in ods to have a different result than biff; just compare the numerical value.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3129 8e941d3f-bd1b-0410-a28a-d453659cc2b4