remove unused matcher

src/app/components/dialogs/user-activation/user-activation.component.html

@@ -2,7 +2,7 @@
       fxLayoutGap="10px">
   <mat-form-field class="input-block">
     <input matInput #userActivationKey type="text" placeholder="{{ 'login.activation-key' | translate }}"
-           [formControl]="activationKeyFormControl" [errorStateMatcher]="matcher" name="activation-key"/>
+           [formControl]="activationKeyFormControl" name="activation-key"/>
     <mat-error *ngIf="activationKeyFormControl.hasError('required')">{{ 'login.activation-key-required' | translate }}</mat-error>
   </mat-form-field>
   <button mat-raised-button color="primary" type="submit">{{ 'login.activate' | translate }}</button>