BrowserOutputObservation: Remove axtree from log (#4206)

Co-authored-by: mamoodi <mamoodiha@gmail.com>

openhands/events/observation/browse.py

@@ -38,6 +38,5 @@ class BrowserOutputObservation(Observation):
             f'Last browser action: {self.last_browser_action}\n'
             f'Last browser action error: {self.last_browser_action_error}\n'
             f'Focused element bid: {self.focused_element_bid}\n'
-            f'axTree: {self.axtree_object}\n'
             f'CONTENT: {self.content}\n'
         )