test: use baseUrl in regenerate test

Author: line-o

src/test/cypress/integration/regenerate_spec.cy.js

@@ -2,7 +2,7 @@ context('Regenerating function documentation', () => {
   it('succeeds', () => {
       cy.timeout(10000); // generation needs some time
       cy.request({
-        url: 'http://127.0.0.1:8080/exist/apps/fundocs/regenerate',
+        url: 'regenerate',
         auth: {
           user: 'admin', 
           password: ''