fix(@angular/build): correctly handle false value in server option

The schema included a top-level `type`, preventing this option from functioning correctly.

Closes: #29969

Author: alan-agius4

packages/angular/build/src/builders/application/options.ts

@@ -259,10 +259,12 @@ export async function normalizeOptions(
     : await getTailwindConfig(searchDirectories, workspaceRoot, context);
 
   let serverEntryPoint: string | undefined;
-  if (options.server) {
+  if (typeof options.server === 'string') {
+    if (options.server === '') {
+      throw new Error('The "server" option cannot be an empty string.');
+    }
+
     serverEntryPoint = path.join(workspaceRoot, options.server);
-  } else if (options.server === '') {
-    throw new Error('The "server" option cannot be an empty string.');
   }
 
   let prerenderOptions;

packages/angular/build/src/builders/application/schema.json

@@ -17,7 +17,6 @@
       "description": "The full path for the browser entry point to the application, relative to the current workspace."
     },
     "server": {
-      "type": "string",
       "description": "The full path for the server entry point to the application, relative to the current workspace.",
       "oneOf": [
         {