keybinds: implement pushactivetobottom dispacher (#3217)

Co-authored-by: Leeman <lstrout@enlj.com>

src/managers/KeybindManager.hpp

@@ -143,6 +143,7 @@ class CKeybindManager {
     static void     pinActive(std::string);
     static void     mouse(std::string);
     static void     bringActiveToTop(std::string);
+    static void     alterZOrder(std::string);
     static void     lockGroups(std::string);
     static void     lockActiveGroup(std::string);
     static void     moveIntoGroup(std::string);