[FIX] web: pdf file not previewed

The pdf_viewer widget fails to load file and hence shows error.
This is due to the wrong controller called(wrong URI passed),
while loading a file using pdfjs.

For files other than images, /web/content controller should
be called since since odoo/odoo#31811.

This is similar to the enterprise fix 793c76298a2b301a2

task-1932190

closes odoo/odoo#33354

Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>

addons/web/static/src/js/fields/basic_fields.js

@@ -1729,7 +1729,7 @@ var FieldPdfViewer = FieldBinaryFile.extend({
                 id: this.res_id,
             };
             var queryString = $.param(queryObj);
-            fileURI = '/web/image?' + queryString
+            fileURI = '/web/content?' + queryString;
         }
         fileURI = encodeURIComponent(fileURI);
         var viewerURL = '/web/static/lib/pdfjs/web/viewer.html?file=';