[FIX] webservice: hide web application specific fields

There was a misuse of `and` instead of `or` in the `invisible` attribute of some
fields that are specific to the Web Application flow

Author: ivantodorovich

webservice/views/webservice_backend.xml

@@ -61,7 +61,7 @@
                         />
                         <field
                             name="redirect_url"
-                            invisible="auth_type != 'oauth2' and oauth2_flow != 'web_application'"
+                            invisible="auth_type != 'oauth2' or oauth2_flow != 'web_application'"
                         />
                         <field
                             name="oauth2_client_auth_method"
@@ -92,12 +92,12 @@
                         />
                         <field
                             name="oauth2_scope"
-                            invisible="auth_type != 'oauth2' and oauth2_flow != 'web_application'"
+                            invisible="auth_type != 'oauth2' or oauth2_flow != 'web_application'"
                             required="auth_type == 'oauth2' and oauth2_flow == 'authorization_code'"
                         />
                         <field
                             name="oauth2_authorization_url"
-                            invisible="auth_type != 'oauth2' and oauth2_flow != 'web_application'"
+                            invisible="auth_type != 'oauth2' or oauth2_flow != 'web_application'"
                             required="auth_type == 'oauth2' and oauth2_flow == 'authorization_code'"
                         />
                         <field