RemoteLinux: Set host name field to read-only for auto-detected devices.

It was disabled before, which prevents scrolling inside the line edit,
so that one cannot see the complete host name if it is wider than the
field.

Change-Id: Ic8bf7c5ed67efc8430be4b298811f348780fa7b6
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/remotelinux/linuxdeviceconfigurationssettingswidget.cpp

@@ -219,7 +219,7 @@ void LinuxDeviceConfigurationsSettingsWidget::displayCurrent()
     m_nameValidator->setDisplayName(current->displayName());
     m_ui->timeoutSpinBox->setValue(sshParams.timeout);
     m_ui->removeConfigButton->setEnabled(!current->isAutoDetected());
-    m_ui->hostLineEdit->setEnabled(!current->isAutoDetected());
+    m_ui->hostLineEdit->setReadOnly(current->isAutoDetected());
     m_ui->sshPortSpinBox->setEnabled(!current->isAutoDetected());
     fillInValues();
 }