A binding with no description but with a tooltip doesn't align correctly in the help panel

[davep]

The issue can be seen with this code:

from textual.app import App
from textual.binding import Binding

class HelpLayoutApp(App[None]):

    BINDINGS = [
        Binding("f1", "gndn1", tooltip="This doesn't line up"),
        Binding("f2", "gndn2", description="Does stuff", tooltip="This is fine"),
    ]

    def on_mount(self) -> None:
        self.action_show_help_panel()

if __name__ == "__main__":
    HelpLayoutApp().run()

giving this:

note the extra space before the tooltip for f1.