Refactor: drop duplicate dspace eager-theme import in eager-themes.module.ts

The original VSB-TUO cherry-pick (#1288) left the dspace eager theme imported
twice (as DSpaceEagerThemeModule and again, unaliased, as EagerThemeModule),
with both listed in imports[]. Angular dedupes module imports so it was
harmless, but it was cruft. Align the file with the other customer backports:
dspace eager theme once + custom eager theme once. The custom theme stays
eager (also keeps untyped-item theming working, ref DSpace#1897).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: jr-rk

src/themes/eager-themes.module.ts

@@ -1,6 +1,5 @@
 import { NgModule } from '@angular/core';
 import { EagerThemeModule as DSpaceEagerThemeModule } from './dspace/eager-theme.module';
-import { EagerThemeModule } from './dspace/eager-theme.module';
 import { EagerThemeModule as CustomEagerThemeModule } from './custom/eager-theme.module';
 
 /**
@@ -18,10 +17,6 @@ import { EagerThemeModule as CustomEagerThemeModule } from './custom/eager-theme
 @NgModule({
   imports: [
     DSpaceEagerThemeModule,
-    // Uncomment this because the `untyped-item` theming is not working when it is commented out.
-    // Issue: https://github.com/DSpace/dspace-angular/issues/1897
-    // Useful info in PR: https://github.com/DSpace/dspace-angular/pull/2262#issuecomment-1557146081
-    EagerThemeModule,
     CustomEagerThemeModule,
   ],
 })