message: [frontend] remove `Network Passphrase` from `Commission`
diff: <h4>Commission</h4>
  <md-content layout-padding flex="100">
  <form name="commissionForm">
  - <div layout="row">
  - <md-input-container flex="100">
  - <label>Network Passphrase</label>
  - <input required name="passphrase" ng-model="commission.passphrase">
  - <div ng-messages="commissionForm.passphrase.$error">
  - <div ng-message="required">This is required.</div>
  - </div>
  - </md-input-container>
  - </div>
  -
  <div layout="row">
  <md-input-container flex="100">
  <label>Joiner PSKd</label>
  