fix(@nguniversal/express-engine): add serverTarget for prerender

Add `serverTarget` for the prerender architect in the install schematic

Closes #2120

(cherry picked from commit ccc0fc1)

Author: bampakoa

modules/express-engine/schematics/install/index.ts

@@ -118,9 +118,11 @@ function updateWorkspaceConfigRule(options: AddUniversalOptions): Rule {
         configurations: {
           production: {
             browserTarget: `${options.project}:build:production`,
+            serverTarget: `${projectName}:server:production`,
           },
           development: {
             browserTarget: `${options.project}:build:development`,
+            serverTarget: `${projectName}:server:development`,
           },
         },
       });