[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=';

addons/web/static/tests/fields/basic_fields_tests.js

@@ -1928,7 +1928,7 @@ QUnit.module('basic_fields', {
         assert.isVisible(form.$('.o_field_widget iframe.o_pdfview_iframe'),
             "there should be an visible iframe");
         assert.hasAttrValue(form.$('.o_field_widget iframe.o_pdfview_iframe'), 'data-src',
-            '/web/static/lib/pdfjs/web/viewer.html?file=%2Fweb%2Fimage%3Fmodel%3Dpartner%26field%3Ddocument%26id%3D1#page=1',
+            '/web/static/lib/pdfjs/web/viewer.html?file=%2Fweb%2Fcontent%3Fmodel%3Dpartner%26field%3Ddocument%26id%3D1#page=1',
             "the src attribute should be correctly set on the iframe");
 
         form.destroy();