fix(combo): prefix/suffix directives not working

Author: SisIvanova

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

@@ -3,7 +3,7 @@
         <ng-content select="[igxLabel]"></ng-content>
     </ng-container>
     <ng-container ngProjectAs="igx-prefix">
-        <ng-content select="igx-prefix"></ng-content>
+        <ng-content select="igx-prefix,[igxPrefix]"></ng-content>
     </ng-container>
     <ng-container ngProjectAs="igx-hint, [igxHint]">
         <ng-content select="igx-hint, [igxHint]"></ng-content>
@@ -15,7 +15,7 @@
             [attr.aria-labelledby]="ariaLabelledBy || label?.id || placeholder"
             (blur)="onBlur()" />
     <ng-container ngProjectAs="igx-suffix">
-        <ng-content select="igx-suffix"></ng-content>
+        <ng-content select="igx-suffix,[igxSuffix]"></ng-content>
     </ng-container>
     <igx-suffix *ngIf="displayValue" [attr.aria-label]="resourceStrings.igx_combo_clearItems_placeholder" class="igx-combo__clear-button"
         (click)="handleClearItems($event)">

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

@@ -5,7 +5,7 @@
     </ng-container>
 
     <ng-container ngProjectAs="igx-prefix">
-        <ng-content select="igx-prefix"></ng-content>
+        <ng-content select="igx-prefix,[igxPrefix]"></ng-content>
     </ng-container>
 
     <ng-container ngProjectAs="igx-hint, [igxHint]">
@@ -21,7 +21,7 @@
         (keyup)="handleKeyUp($event)" (keydown)="handleKeyDown($event)" (blur)="onBlur()" (paste)="handleInputChange($event)"/>
 
     <ng-container ngProjectAs="igx-suffix">
-        <ng-content select="igx-suffix"></ng-content>
+        <ng-content select="igx-suffix,[igxSuffix]"></ng-content>
     </ng-container>
 
     <igx-suffix *ngIf="hasSelectedItem" [attr.aria-label]="resourceStrings.igx_combo_clearItems_placeholder" class="igx-combo__clear-button"