Fix mypy 'safe-super' error.

Mypy now complains about the useless constructor in the
`ControllerDependencyInjector` abstract base class:

  full_offline_backup_for_todoist/runtime.py:15: error: Call to
  abstract method "__init__" of "ControllerDependencyInjector" with
  trivial body via super() is unsafe  [safe-super]

Since the call to the constructor of `ControllerDependencyInjector`
is indeed useless (the constructor is empty), just remove it.

full_offline_backup_for_todoist/controller.py

@@ -15,10 +15,6 @@ class TodoistAuth(NamedTuple):
 class ControllerDependencyInjector(metaclass=ABCMeta):
     """ Rudimentary dependency injection container for the controller """
 
-    @abstractmethod
-    def __init__(self, auth: TodoistAuth, verbose: bool):
-        """ Initializes the dependencies according to the user configuration """
-
     @property
     @abstractmethod
     def tracer(self) -> Tracer:

full_offline_backup_for_todoist/runtime.py

@@ -12,7 +12,6 @@ class RuntimeControllerDependencyInjector(ControllerDependencyInjector):
     """ Implementation of the dependency injection container for the actual runtime objects """
 
     def __init__(self, auth: TodoistAuth, verbose: bool):
-        super().__init__(auth, verbose)
         self.__tracer = ConsoleTracer() if verbose else NullTracer()
         urldownloader = URLLibURLDownloader(self.__tracer)
         todoist_api = TodoistApi(auth.token, self.__tracer, urldownloader)

tests/test_controller.py

@@ -11,7 +11,6 @@ class TestControllerDependencyInjector(ControllerDependencyInjector):
 
     def __init__(self, test_tracer, test_todoist_downloader,
                  test_todoist_attachments_downloader):
-        super().__init__("", False)
         self.__test_tracer = test_tracer
         self.__test_todoist_downloader = test_todoist_downloader
         self.__test_todoist_attachments_downloader = test_todoist_attachments_downloader