fix(app): fix garbled inline app output

Fix garbled inline app output when `inline_no_clear=True`.

Currently the terminal cursor isn't actually "reset" before printing the
screen contents. This doesn't matter for most inline apps as the cursor
is already offset at (0, 0). But if the app contains an `Input` widget,
this will update the cursor position so the output will be garbled.

Fixes #6064

Author: TomJGooding

src/textual/app.py

@@ -3294,8 +3294,9 @@ async def invoke_ready_callback() -> None:
                         if self._driver.is_inline:
                             cursor_x, cursor_y = self._previous_cursor_position
                             self._driver.write(
-                                Control.move(-cursor_x, -cursor_y + 1).segment.text
+                                Control.move(-cursor_x, -cursor_y).segment.text
                             )
+                            self._driver.flush()
                             if inline_no_clear and not self.app._exit_renderables:
                                 console = Console()
                                 try: