fix(date-picker/time-picker): remove default readonly state

Author: SisIvanova

projects/igniteui-angular/src/lib/grids/filtering/base/grid-filtering-row.component.html

@@ -60,7 +60,6 @@
 <ng-template #defaultDateUI>
     <igx-date-picker #picker
         [(value)]="value"
-        [readOnly]="true"
         [outlet]="filteringService.grid.outlet"
         [locale]="filteringService.grid.locale"
         (click)="expression.condition.isUnary ? null : picker.open()"
@@ -112,7 +111,6 @@
         [formatter]="column.formatter"
         [outlet]="filteringService.grid.outlet"
         type="box"
-        [readOnly]="true"
         [style.--ig-size]="filteringElementsSize"
         [placeholder]="placeholder"
         (closed)="focusEditElement()"

projects/igniteui-angular/src/lib/grids/filtering/excel-style/excel-style-date-expression.component.html

@@ -26,7 +26,6 @@
         [locale]="grid.locale"
         [outlet]="grid.outlet"
         (click)="picker.open()"
-        [readOnly]="true"
         [placeholder]="inputDatePlaceholder"
         [displayFormat]="column.pipeArgs.format"
         [formatter]="column.formatter"
@@ -45,7 +44,6 @@
         [locale]="grid.locale"
         [outlet]="grid.outlet"
         (click)="picker.open()"
-        [readOnly]="true"
         [placeholder]="inputTimePlaceholder"
         [displayFormat]="column.pipeArgs.format"
         [inputFormat]="column.editorOptions?.dateTimeFormat"

projects/igniteui-angular/src/lib/query-builder/query-builder-tree.component.html

@@ -388,7 +388,6 @@
                                 (keydown)="openPicker($event)"
                                 (click)="picker.open()"
                                 type="box"
-                                [readOnly]="true"
                                 [disabled]="isSearchValueInputDisabled()"
                                 [locale]="this.locale"
                                 [outlet]="pickerOutlet"
@@ -409,7 +408,6 @@
                                 (click)="picker.open()"
                                 (keydown)="openPicker($event)"
                                 type="box"
-                                [readOnly]="true"
                                 [disabled]="isSearchValueInputDisabled()"
                                 [locale]="this.locale"
                                 [outlet]="pickerOutlet"