fix(@schematics/angular): remove baseUrl from universal tsconfig

The baseUrl is used for non relative module imports, and we should always use the baseUrl set in the workspace tsconfig. When having path mappings set at workspace level and setting a `baseUrl` in the server tsconfig, this paths will no longer work as paths mapping as relative to the baseUrl.

Fixes #13935

Author: alan-agius4

packages/schematics/angular/universal/files/root/__tsconfigFileName__.json.template

@@ -1,10 +1,9 @@
 {
   "extends": "./<%= tsConfigExtends %>",
   "compilerOptions": {
-    "outDir": "<%= outDir %>-server",
-    "baseUrl": "."
+    "outDir": "<%= outDir %>-server"
   },
   "angularCompilerOptions": {
-    "entryModule": "<%= rootInSrc ? '' : 'src/' %><%= appDir %>/<%= stripTsExtension(rootModuleFileName) %>#<%= rootModuleClassName %>"
+    "entryModule": "./<%= rootInSrc ? '' : 'src/' %><%= appDir %>/<%= stripTsExtension(rootModuleFileName) %>#<%= rootModuleClassName %>"
   }
 }

packages/schematics/angular/universal/index_spec.ts

@@ -80,10 +80,9 @@ describe('Universal Schematic', () => {
       extends: './tsconfig.app.json',
       compilerOptions: {
         outDir: './out-tsc/app-server',
-        baseUrl: '.',
       },
       angularCompilerOptions: {
-        entryModule: 'src/app/app.server.module#AppServerModule',
+        entryModule: './src/app/app.server.module#AppServerModule',
       },
     });
     const angularConfig = JSON.parse(tree.readContent('angular.json'));
@@ -100,10 +99,9 @@ describe('Universal Schematic', () => {
       extends: './tsconfig.app.json',
       compilerOptions: {
         outDir: '../../out-tsc/app-server',
-        baseUrl: '.',
       },
       angularCompilerOptions: {
-        entryModule: 'src/app/app.server.module#AppServerModule',
+        entryModule: './src/app/app.server.module#AppServerModule',
       },
     });
     const angularConfig = JSON.parse(tree.readContent('angular.json'));