[update] forcing pdf content type for response

Author: Stanislav-Wolski

WEB-INF/src/com/dhtmlx/scheduler/PDFWriter.java

@@ -223,6 +223,7 @@ private void printWatermark() throws Exception {
 }
 
 private void createPDF(double[] orientation) throws Exception {
+this.resp.setContentType("application/pdf");
 this.pdf = new PDF(this.resp.getOutputStream());
 
 this.f1 = new Font(pdf, "Helvetica");