fix: typos root directory indicator

[chrisgrieser]

This PR removes .git as root pattern. Doing so fixes some issues associated with nested workspaces / repos with multiple typos.toml configuration file, that are further elaborated here: tekumara/typos-lsp#23 Long story short, having .git as root indicator can in some situations lead to not detecting typos.toml configuration files.

typos-lsp runs fine in single-file-mode when no root pattern can be found. In fact, as far as I can tell, picking up a configuration file is the only reason the typos-lsp actually needs a root pattern for, otherwise single file mode works fine, probably since the LSP is only a wrapper around the typos cli. Thus, there should be no downside to removing .git as root pattern, and the only consequence would be to fix issues with multiple typos.toml files.