Fix clicking the back button on the toolbar does not finish FullMarkdownActivity.

app/src/main/java/ml/docilealligator/infinityforreddit/activities/FullMarkdownActivity.java

@@ -208,10 +208,8 @@ public class FullMarkdownActivity extends BaseActivity {
         if (getIntent().getBooleanExtra(EXTRA_SUBMIT_POST, false)) {
             getMenuInflater().inflate(R.menu.full_markdown_activity, menu);
             applyMenuItemTheme(menu);
-            return true;
         }
-
-        return false;
+        return true;
     }
 
     @Override