fpspreadsheet: Add workaround for missing xml spaces to TsOpenDocReader.ReadNumFormats.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3120 8e941d3f-bd1b-0410-a28a-d453659cc2b4
fpspreadsheet: Fix workaround in previous commit which did not work.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3121 8e941d3f-bd1b-0410-a28a-d453659cc2b4