fix(combo): Remove useless check for multiselection and use the textKey

Author: dkamburov

projects/igniteui-angular-wrappers/src/lib/igcombo/igcombo.component.ts

@@ -58,9 +58,8 @@ export class IgComboComponent extends IgControlBase<IgCombo> implements ControlV
                 jQuery(this._el).on('input', evt => {
                     // D.K. #324 Do not override the model value if the text value is representing the same model value
                     const item = jQuery(this._el).data('igCombo').itemsFromValue(this._model.model);
-                    if (this.options.multiSelection && this.options.multiSelection.enabled ||
-                        !item ||
-                        item.data && item.data.text !== evt.target.value) {
+                    if (!item ||
+                        item.data && item.data[this.options.textKey] !== evt.target.value) {
                         this._model.viewToModelUpdate(evt.target.value);
                     }
                 });