Bugfix: back arrow in setting is now working.

Fixes #1932.

src/main/java/de/dennisguse/opentracks/settings/SettingsActivity.java

@@ -42,8 +42,8 @@ protected void onCreate(Bundle savedInstanceState) {
             fragment = new MainSettingsFragment();
         }
 
-        setSupportActionBar(viewBinding.bottomAppBarLayout.bottomAppBar);
         setSupportActionBar(viewBinding.topAppBar);
+        setSupportActionBar(viewBinding.bottomAppBarLayout.bottomAppBar);
 
         getSupportFragmentManager().beginTransaction().replace(R.id.settings_fragment, fragment).commit();
     }