Update WD_MAP_Excel.bas

Updated Sub CheckForExcelFile() to point to a .xlsx type instead of a .xlsm type of file.  There is no longer code behind the Excel file so there is no longer any need to save as a Module enabled file type.

Updated Sub CopyHeadingsToArray() 
  - removed storing a reference to Header 1.  There was no need for it to be copied into Excel.
  - reformatted the array to store Header 2 to the first element and Header 3 to the second element.