refactor: correct copyright test in db-footer component (#3185)

* refactor: Simplify copyright display in db-footer component

Removed getCopyRight method and updated copyright display.

* Update db-footer.tsx

* Update db-footer.tsx

* Update db-footer.cy.js

Author: mfranzke

e2e/cypress/e2e/02-0-navigation/db-footer.cy.js

@@ -11,7 +11,7 @@ context('db-footer', () => {
   it('Standard footer exists', function () {
     cy.get(selector).eq(0).should('have.class', 'has-border');
     cy.get(selector).eq(0);
-    cy.get(`${selector} > span`).contains('Copyright 2025 DB Systel');
+    cy.get(`${selector} > span`).contains('Copyright 2026 DB Systel');
   });
 
   it('Custom footer exists', function () {