fix typo from last commit

src/game/ui/context/RecruitingMenu.hpp

@@ -59,8 +59,9 @@ class RecruitingMenu : public Scene
         std::vector<UnitTypeId> m_options;        // All available options
         int                     m_x;              // x-position
         int                     m_y;              // y-position
-        const std::unordered_map<UnitTypeId, std::string> unitNames; // maps UnitIds to unnits name
-        std::unordered_map<int, UnitTypeId>               cost2UnitId;  // maps cost to unitIds
+        const std::unordered_map<UnitTypeId, std::string>
+                                            m_unitNames;   // maps UnitIds to unnits name
+        std::unordered_map<int, UnitTypeId> m_cost2UnitId; // maps cost to unitIds
         UnitTypeId                          m_selectedId;  // Currently selected Unit
 
         void selectSprite();