Fixed: PDF-Check: Just delete unsafe PDF files (OFBIZ-13190)

At first I planned to change the implementation to just delete the PDF file
within isValidPdfFile if the PDF's safeState is false. Then I found out that the
file deletion already happens withn isValidFile (deleteBadFile) -
hence there is no need to delete the invalid file within the PDF check itself.

Thanks: Sixty One

framework/security/src/main/java/org/apache/ofbiz/security/SecuredUpload.java

@@ -586,8 +586,6 @@ private static boolean isValidPdfFile(String fileName) {
                     + "For security reason it's not accepted as a such file",
                     MODULE);
         }
-        file = new File(fileName);
-        file.delete();
         return safeState;
     }