fix(combo): fix combo search input theme and type (#15351)

Author: didimmova

projects/igniteui-angular/src/lib/combo/combo.component.html

@@ -36,7 +36,7 @@
     [width]="itemsWidth || '100%'" (opening)="handleOpening($event)" (closing)="handleClosing($event)"
     (opened)="handleOpened()" (closed)="handleClosed()">
     <div class="igx-combo__search" *ngIf="displaySearchInput">
-        <igx-input-group>
+        <igx-input-group type="line">
             <input igxInput #searchInput name="searchInput" autocomplete="off" type="text"
                    [(ngModel)]="searchValue" (ngModelChange)="handleInputChange($event)" (keyup)="handleKeyUp($event)"
                    (keydown)="handleKeyDown($event)" (focus)="dropdown.onBlur($event)" [attr.placeholder]="getSearchPlaceholderText()"

projects/igniteui-angular/src/lib/input-group/input-group.component.ts

@@ -1,6 +1,5 @@
 import { DOCUMENT, NgIf, NgTemplateOutlet, NgClass, NgSwitch, NgSwitchCase, NgSwitchDefault } from '@angular/common';
 import {
-    AfterViewInit,
     ChangeDetectorRef,
     Component,
     ContentChild,
@@ -35,7 +34,7 @@ import { IgxTheme, THEME_TOKEN, ThemeToken } from '../services/theme/theme.token
     providers: [{ provide: IgxInputGroupBase, useExisting: IgxInputGroupComponent }],
     imports: [NgIf, NgTemplateOutlet, IgxPrefixDirective, IgxButtonDirective, NgClass, IgxSuffixDirective, IgxIconComponent, NgSwitch, NgSwitchCase, NgSwitchDefault]
 })
-export class IgxInputGroupComponent implements IgxInputGroupBase, AfterViewInit {
+export class IgxInputGroupComponent implements IgxInputGroupBase {
     /**
      * Sets the resource strings.
      * By default it uses EN resources.
@@ -453,7 +452,7 @@ export class IgxInputGroupComponent implements IgxInputGroupBase, AfterViewInit
     }
 
     /** @hidden @internal */
-    public ngAfterViewInit() {
+    public ngAfterContentChecked() {
         this.setComponentTheme();
     }
 }