remove old bindings format support

src/files/engine_paths.cpp

@@ -61,10 +61,6 @@ fs::path EnginePaths::getControlsFile() {
     return userfiles/fs::path(CONTROLS_FILE);
 }
 
-fs::path EnginePaths::getControlsFileOld() {
-    return userfiles/fs::path("controls.json");
-}
-
 fs::path EnginePaths::getSettingsFile() {
     return userfiles/fs::path(SETTINGS_FILE);
 }

src/files/engine_paths.hpp

@@ -29,7 +29,6 @@ public:
     fs::path getWorldFolder();
     fs::path getWorldFolder(const std::string& name);
     fs::path getControlsFile();
-    fs::path getControlsFileOld(); // TODO: remove in 0.22
     fs::path getSettingsFile();
     bool isWorldNameUsed(const std::string& name);