Fix automatic dark mode.

- Users are able to select the automatic dark mode checkbox
	- If it is not selected it should not allow users to pick another theme.

src/ui/page/settings/view.jsx

@@ -153,7 +153,6 @@ class SettingsPage extends React.PureComponent<Props, State> {
     } = this.props;
 
     const noDaemonSettings = !daemonSettings || Object.keys(daemonSettings).length === 0;
-    const isDarkModeEnabled = currentTheme === 'dark';
 
     const defaultMaxKeyFee = { currency: 'USD', amount: 50 };
     const disableMaxKeyFee = !(daemonSettings && daemonSettings.max_key_fee);
@@ -350,7 +349,6 @@ class SettingsPage extends React.PureComponent<Props, State> {
                     name="automatic_dark_mode"
                     onChange={() => this.onAutomaticDarkModeChange(!automaticDarkModeEnabled)}
                     checked={automaticDarkModeEnabled}
-                    disabled={isDarkModeEnabled}
                     label={__('Automatic dark mode (9pm to 8am)')}
                   />
                 </fieldset-section>