chore(*): remove suppresAutoFocus property and fix styling

Author: onlyexeption

projects/igniteui-angular/src/lib/core/styles/components/grid/_excel-filtering-theme.scss

@@ -378,7 +378,7 @@
         align-items: center;
         padding: 0 rem(16px);
 
-        igx-input-group {
+        igx-select {
             flex-grow: 1;
             flex-basis: 40%;
             margin: rem(16px) 0;

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

@@ -16,7 +16,7 @@
 
 <igx-date-picker #datePicker mode="dropdown" [(ngModel)]="expressionUI.expression.searchVal" [locale]="grid.locale" [outlet]="grid.outletDirective">
     <ng-template igxDatePickerTemplate let-openDialog="openDialog" let-value="value">
-        <igx-input-group #dropDownTarget type="box" [displayDensity]="displayDensity" [supressInputAutofocus]="true">
+        <igx-input-group #dropDownTarget type="box" [displayDensity]="displayDensity">
             <input #input
                     igxInput
                     tabindex="0"

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

@@ -14,7 +14,7 @@
     </igx-select-item>
 </igx-select>
 
-<igx-input-group #inputGroupValues type="box" [displayDensity]="displayDensity" [supressInputAutofocus]="true">
+<igx-input-group #inputGroupValues type="box" [displayDensity]="displayDensity">
     <input
         #inputValues
         igxInput