refactor: cleanup and document Scrollbar (#5334)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>
Co-authored-by: Daniel Sage <sagedanielr@gmail.com>

tests/src/ModerationAction.cpp

@@ -5,8 +5,8 @@
 #include "singletons/Emotes.hpp"
 #include "singletons/Resources.hpp"
 #include "singletons/Settings.hpp"
+#include "Test.hpp"
 
-#include <gtest/gtest.h>
 #include <QString>
 
 using namespace chatterino;