Manager: Disable resizing the "Searching for VMs" window

and the update checker window

src/qt/qt_updatecheckdialog.cpp

@@ -32,6 +32,7 @@ UpdateCheckDialog(const UpdateCheck::UpdateChannel channel, QWidget *parent) : Q
     ui->setupUi(this);
     setWindowTitle(tr("Update check"));
     ui->statusLabel->setHidden(true);
+    this->setFixedSize(400, 130);
     updateChannel = channel;
     currentVersion = UpdateCheck::getCurrentVersion(updateChannel);
     connect(updateCheck, &UpdateCheck::updateCheckError, [=](const QString &errorMsg) {

src/qt/qt_updatecheckdialog.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>350</width>
-    <height>134</height>
+    <width>400</width>
+    <height>130</height>
    </rect>
   </property>
   <property name="sizePolicy">

src/qt/qt_vmmanager_system.cpp

@@ -126,6 +126,7 @@ VMManagerSystem::scanForConfigs(QWidget* parent, const QString &searchPath)
     progDialog.setMinimum(0);
     progDialog.setMaximum(0);
     progDialog.setWindowFlags(progDialog.windowFlags() & ~Qt::WindowCloseButtonHint);
+    progDialog.setFixedSize(progDialog.sizeHint());
     QElapsedTimer scanTimer;
     scanTimer.start();
     QVector<VMManagerSystem *> system_configs;