refactor(common): update the NgOptimizedImage message to use @if in…

…stead of `*ngIf` (#59131)

This commit updates an error message to mention `@if` rather than the `*ngIf` directive.
PR Close #59131

packages/common/src/directives/ng_optimized_image/ng_optimized_image.ts

@@ -971,7 +971,7 @@ function postInitInputChangeError(dir: NgOptimizedImage, inputName: string): {}
     `${imgDirectiveDetails(dir.ngSrc)} \`${inputName}\` was updated after initialization. ` +
       `The NgOptimizedImage directive will not react to this input change. ${reason} ` +
       `To fix this, either switch \`${inputName}\` to a static value ` +
-      `or wrap the image element in an *ngIf that is gated on the necessary value.`,
+      `or wrap the image element in an @if that is gated on the necessary value.`,
   );
 }