qml: trsutedcoin layout consistency

electrum/plugins/trustedcoin/qml/Disclaimer.qml

@@ -15,7 +15,7 @@ WizardComponent {
         width: parent.width
 
         Label {
-            Layout.preferredWidth: parent.width
+            Layout.fillWidth: true
             text: plugin ? plugin.disclaimer : ''
             wrapMode: Text.Wrap
         }

electrum/plugins/trustedcoin/qml/ShowConfirmOTP.qml

@@ -87,8 +87,8 @@ WizardComponent {
         }
 
         Label {
+            Layout.fillWidth: true
             visible: !otpVerified && plugin.remoteKeyState == 'wallet_known'
-            Layout.preferredWidth: parent.width
             wrapMode: Text.Wrap
             text: qsTr('Otherwise, you can request your OTP secret from the server, by pressing the button below')
         }