Allow enabling debug messages

app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java

@@ -259,6 +259,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             @Override
             public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
                 prefs.edit().putBoolean("debug", checked).apply();
+                Log.setDebug(checked);
                 grpDebug.setVisibility(checked || BuildConfig.DEBUG ? View.VISIBLE : View.GONE);
             }
         });