GUI: PSBTOperationsDialog: Support translating window title

src/qt/forms/psbtoperationsdialog.ui

@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>Dialog</string>
+   <string>PSBT Operations</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout">
    <property name="spacing">

src/qt/psbtoperationsdialog.cpp

@@ -31,7 +31,6 @@ PSBTOperationsDialog::PSBTOperationsDialog(
                                                                              m_client_model(client_model)
 {
     m_ui->setupUi(this);
-    setWindowTitle("PSBT Operations");
 
     connect(m_ui->signTransactionButton, &QPushButton::clicked, this, &PSBTOperationsDialog::signTransaction);
     connect(m_ui->broadcastTransactionButton, &QPushButton::clicked, this, &PSBTOperationsDialog::broadcastTransaction);