Remove unused imports and clean up UI code

src/metar_navigate/ui/ui.py

@@ -1,8 +1,6 @@
-import time
 from abc import ABC, abstractmethod
 
 from rich import console
-from rich.live import Live
 
 
 class UIInterface(ABC):
@@ -148,7 +146,7 @@ class RichInterface(UIInterface):
             self.console.show_cursor(True)
             exit(69)
 
-            return
+
 
         if self.mode == "configure":
             self.configure_run_mode()