Enable dark theme for release builds.

briar-android/src/main/java/org/briarproject/briar/android/TestingConstants.java

@@ -31,11 +31,6 @@ public interface TestingConstants {
 			BuildConfig.BuildTimestamp + 90 * 24 * 60 * 60 * 1000L :
 			Long.MAX_VALUE;
 
-	/**
-	 * Feature flag for enabling the dark UI theme in release builds.
-	 */
-	boolean FEATURE_FLAG_DARK_THEME = false;
-
 	/**
 	 * Feature flag for enabling the PIN lock in release builds.
 	 */

briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsFragment.java

@@ -77,7 +77,6 @@ import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
-import static org.briarproject.briar.android.TestingConstants.FEATURE_FLAG_DARK_THEME;
 import static org.briarproject.briar.android.TestingConstants.FEATURE_FLAG_PIN_LOCK;
 import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_RINGTONE;
@@ -227,7 +226,6 @@ public class SettingsFragment extends PreferenceFragmentCompat
 					}
 			);
 		} else {
-			theme.setVisible(FEATURE_FLAG_DARK_THEME);
 			screenLock.setVisible(FEATURE_FLAG_PIN_LOCK);
 			screenLockTimeout.setVisible(FEATURE_FLAG_PIN_LOCK);