Fix company name replacement method

[VeyronSakai]

Overview

• Fixed an issue where the company name was not properly replaced with the repository owner's name when generating a repository by Use this template.
  • For example, when I generated a repository, an unnecessary Co., Ltd was added at the end, such as VeyronSakai Co., Ltd.
• I thought it would be necessary to replace .editorconfig as well, so I did that.

Operation Confirmation

I added the same changes as this PR to the fork version of this repository, VeyronSakai/RoslynAnalyzerTemplate, and generated a repository, DummyRoslynAnalyzer2 by Use this template, and made sure that the names were replaced appropriately.

Template cleanup commit

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[Kuniwak]

@VeyronSakai Thank you for the contribution!