Remove no longer used material customization in spell correct element

#521

projects/common/components/input-elements/spell-correct.component.ts

@@ -66,11 +66,6 @@ import { TextInputComponent } from 'common/directives/text-input-component.direc
     </div>
   `,
   styles: [`
-    /* TODO(mdc-migration): The following rule targets internal classes of form-field that may no longer apply for the MDC version. */
-    :host ::ng-deep .small-input div.mat-form-field-infix {
-      border-top: none;
-      padding: 0.75em 0 0.25em 0;
-    }
     .fx-column-start-stretch {
       box-sizing: border-box;
       display: flex;