[BUGFIX] Replace wrong routeIdentifier in example code

Some code examples for the ShortcutButton
"routeIdentifier" property, introduced in #93093,
used the non existing "web_view" identifier.

Using this code example will therefore lead to
a RouteNotFoundException exception.

This is now fixed by using the correct identifier
for the viewpage module.

Resolves: #96945
Related: #93093
Releases: main, 11.5
Change-Id: Icf0a7cd476328661a630f24655ec53fe34b78745
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73543


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>