fix: right prompt not aligned correctly

closes #1241

Author: jnoortheen

src/prompt_toolkit/shortcuts/prompt.py

@@ -689,7 +689,7 @@ def multi_column_complete_style() -> bool:
                         # The right prompt.
                         Float(
                             right=0,
-                            bottom=0,
+                            top=0,
                             hide_when_covering_content=True,
                             content=_RPrompt(lambda: self.rprompt),
                         ),