Title: Fix TypeError in harness.py by updating Coder.create method calls

[bscriver123]

Pull Request Description:

Description

This pull request addresses the TypeError encountered while running harness.py on swebench-lite. The error was caused by passing an unexpected keyword argument git_dname to Coder.create() which is not present in the latest code on aider-chat.

To resolve this, the pull request modifies the code to remove the git_dname parameter from the call to Coder.create() in harness.py. However, after making this change, another error TypeError: Coder.__init__() got an unexpected keyword argument 'max_chat_history_tokens' occurred. This error is due to passing the max_chat_history_tokens parameter to the Coder constructor, which is also not valid.

This PR aims to fix these issues by updating the parameter passing in the Coder.create() and Coder constructor methods to align with the latest code on aider-chat.

Changes Made

• Removed the git_dname parameter from the call to Coder.create() in harness.py.
• Corrected the parameter passing in the Coder constructor to resolve the TypeError: Coder.__init__() got an unexpected keyword argument 'max_chat_history_tokens' error.

Related Issue

Fixes #ISSUE_NUMBER (Replace ISSUE_NUMBER with the actual issue number being addressed)

Please review the changes and provide feedback.