feat(libreoffice): add viewer preference form fields

.bruno/LibreOffice/Convert to PDF.bru

@@ -31,6 +31,21 @@ body:multipart-form {
   ~skipEmptyPages: false
   ~addOriginalDocumentAsStream: false
   ~singlePageSheets: false
+  ~initialView: 0
+  ~initialPage: 1
+  ~magnification: 0
+  ~zoom: 100
+  ~pageLayout: 0
+  ~firstPageOnLeft: false
+  ~resizeWindowToInitialPage: false
+  ~centerWindow: false
+  ~openInFullScreenMode: false
+  ~displayPDFDocumentTitle: true
+  ~hideViewerMenubar: false
+  ~hideViewerToolbar: false
+  ~hideViewerWindowControls: false
+  ~useTransitionEffects: true
+  ~openBookmarkLevels: -1
   ~losslessImageCompression: false
   ~quality: 90
   ~reduceImageResolution: false