fix(module:select): input field length restricted to 82px (#7626)

Signed-off-by: LemniscateX <1311331039@qq.com>

Signed-off-by: LemniscateX <1311331039@qq.com>

Author: LemniscateX

components/select/select-search.component.ts

@@ -79,7 +79,7 @@ export class NzSelectSearchComponent implements AfterViewInit, OnChanges {
     const hostDOM = this.elementRef.nativeElement;
     const inputDOM = this.inputElement.nativeElement;
     this.renderer.removeStyle(hostDOM, 'width');
-    mirrorDOM.innerHTML = this.renderer.createText(`${inputDOM.value} `);
+    this.renderer.setProperty(mirrorDOM, 'textContent', `${inputDOM.value}\u00a0`);
     this.renderer.setStyle(hostDOM, 'width', `${mirrorDOM.scrollWidth}px`);
   }