fpspreadsheet: Fix fpspreadsheetchart broken in rev 3020. For the moment don't use the t1.xls in the fpschart folder - it uses a "shared formula" which does not load with the current biff machinery.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3125 8e941d3f-bd1b-0410-a28a-d453659cc2b4