Fix presentation mode not working with correct fullscreen request name

Author: darioncassel

mfr/extensions/pdf/static/web/viewer.js

@@ -1969,8 +1969,8 @@ var PresentationMode = {
       this.container.requestFullscreen();
     } else if (this.container.mozRequestFullScreen) {
       this.container.mozRequestFullScreen();
-    } else if (this.container.webkitRequestFullScreen) {
-      this.container.webkitRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT);
+    } else if (this.container.webkitRequestFullscreen) {
+      this.container.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
     } else if (this.container.msRequestFullscreen) {
       this.container.msRequestFullscreen();
     } else {