fix(module:list): specify template ref context to match instantiation (…

…#7756)

* input was specified as TemplateRef<void> but usage of template provides a context
* providing a context was/is possible because Angular does not check the template reference and the provided context to match
* consuming the context and pass in a template ref with context is also possible because a template ref is TemplateRef<any> per default

components/list/list.component.ts

@@ -116,7 +116,7 @@ export class NzListComponent implements AfterContentInit, OnChanges, OnDestroy,
   @Input() nzHeader?: string | TemplateRef<void>;
   @Input() nzFooter?: string | TemplateRef<void>;
   @Input() nzItemLayout: NzDirectionVHType = 'horizontal';
-  @Input() nzRenderItem: TemplateRef<void> | null = null;
+  @Input() nzRenderItem: TemplateRef<{ $implicit: NzSafeAny; index: number }> | null = null;
   @Input() @InputBoolean() nzLoading = false;
   @Input() nzLoadMore: TemplateRef<void> | null = null;
   @Input() nzPagination?: TemplateRef<void>;