fix: compilation on macOS without precompiled headers (#3741)

Co-authored-by: zneix <zneix@zneix.eu>

src/providers/ffz/FfzBadges.hpp

@@ -9,6 +9,7 @@
 #include <map>
 #include <memory>
 #include <shared_mutex>
+#include <unordered_map>
 #include <vector>
 
 #include <QColor>

src/widgets/splits/SplitContainer.hpp

@@ -14,6 +14,7 @@
 #include <functional>
 #include <pajlada/signals/signal.hpp>
 #include <pajlada/signals/signalholder.hpp>
+#include <unordered_map>
 #include <vector>
 
 class QJsonObject;