Add minor UI updates to screen lock.

app/src/main/java/org/thoughtcrime/securesms/PassphraseActivity.java

@@ -63,6 +63,7 @@ public abstract class PassphraseActivity extends BaseActivity {
         if (nextIntent != null) {
             try {
                 startActivity(nextIntent);
+                overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
             } catch (java.lang.SecurityException e) {
                 Log.w(TAG, "Access permission not passed from PassphraseActivity, retry sharing.");
             }

app/src/main/java/org/thoughtcrime/securesms/PassphrasePromptActivity.java

@@ -387,6 +387,8 @@ public class PassphrasePromptActivity extends PassphraseActivity {
     @Override
     public void onAuthenticationSucceeded(@NonNull BiometricPrompt.AuthenticationResult result) {
       Log.i(TAG, "onAuthenticationSucceeded");
+
+      lockScreenButton.setOnClickListener(null);
       unlockView.addAnimatorListener(new AnimationCompleteListener() {
         @Override
         public void onAnimationEnd(Animator animation) {