Fix cursor that remains in hidden state when application exits.

When we have an application that doesn't show the cursor and `erase_when_done`
is being used, the cursor remained hidden after the application terminated.

src/prompt_toolkit/renderer.py

@@ -257,7 +257,7 @@ def get_max_column_index(row: dict[int, Char]) -> int:
     # give weird artifacts on resize events.)
     reset_attributes()
 
-    if screen.show_cursor or is_done:
+    if screen.show_cursor:
         output.show_cursor()
 
     return current_pos, last_style
@@ -416,6 +416,7 @@ def reset(self, _scroll: bool = False, leave_alternate_screen: bool = True) -> N
             self._bracketed_paste_enabled = False
 
         self.output.reset_cursor_shape()
+        self.output.show_cursor()
 
         # NOTE: No need to set/reset cursor key mode here.