message: feat(transaction-detail): correct icon button styling
diff: <ion-fab vertical="bottom" horizontal="end" slot="fixed">
  <ion-button color="primary" shape="round" (click)="signAndGoToNextPage()">
  - <ion-icon src="assets/icons/md-check.svg"></ion-icon>
  + <ion-icon slot="start" src="assets/icons/md-check.svg"></ion-icon>
  {{ 'transaction-detail.sign-tx_label' | translate }}
  </ion-button>
  </ion-fab>
  