Fix shape mismatch error in segmentation by correcting mask parameter.

[haesleinhuepf]

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In response to issue #33, enhancements were made to the segmentation workflow in the Jupyter notebook by replacing the incorrect mask parameter in the segmentation.watershed function. The mask was originally set to image_gray, causing a shape mismatch error, and has been corrected to image_tophat to ensure the proper execution of the notebook for cell segmentation.

During solving this task, the following errors occurred:

• Error during {'action': 'modify', 'filename': 'notebooks/segmentation_analysis.ipynb'}: 409 {"message": "notebooks/segmentation_analysis.ipynb does not match e8214a957991fc35336ca6918d76ba221398fb2f", "documentation_url": "https://docs.github.com/rest/repos/contents#create-or-update-file-contents", "status": "409"}

      Traceback (most recent call last):
    File "C:\structure\code\git-bob\src\git_bob\_ai_github_utilities.py", line 392, in solve_github_issue
      message = filename + ":" + create_or_modify_file(repository, issue, filename, branch_name, discussion,
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\structure\code\git-bob\src\git_bob\_ai_github_utilities.py", line 298, in create_or_modify_file
      execute_notebook_in_repository(repository, branch_name, filename)
    File "C:\structure\code\git-bob\src\git_bob\_github_utilities.py", line 753, in execute_notebook_in_repository
      repo.update_file(file_path, commit_message, new_notebook_content, file.sha, branch=branch_name)
    File "C:\Users\rober\miniforge3\envs\devbio-napari-env\Lib\site-packages\github\Repository.py", line 2541, in update_file
      headers, data = self._requester.requestJsonAndCheck(
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\rober\miniforge3\envs\devbio-napari-env\Lib\site-packages\github\Requester.py", line 550, in requestJsonAndCheck
      return self.__check(*self.requestJson(verb, url, parameters, headers, input, self.__customConnection(url)))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "C:\Users\rober\miniforge3\envs\devbio-napari-env\Lib\site-packages\github\Requester.py", line 611, in __check
      raise self.createException(status, responseHeaders, data)
  github.GithubException.GithubException: 409 {"message": "notebooks/segmentation_analysis.ipynb does not match e8214a957991fc35336ca6918d76ba221398fb2f", "documentation_url": "https://docs.github.com/rest/repos/contents#create-or-update-file-contents", "status": "409"}
  

closes #33