staged signs no longer work for vim-fugitive index buffers

### Description

As of commit 0edca9d1a06db1ae95d79c210825711172fb2802, it seems like the staged signs no longer work for `fugitive://` buffers (and potentially `gitsigns://` buffers as well).

https://github.com/lewis6991/gitsigns.nvim/blob/f9170c3b74d94525201e5a40543d8924a2a883a7/lua/gitsigns/manager.lua#L494-L511

`vim.bo[bufnr].buftype` is empty for these, so it looks like that new conditional is skipped since `buf_is_editable_file` is true.

### Neovim version

NVIM v0.11.0-dev-1611+g3a25995f30

### Operating system and version

RHEL 8

### Expected behavior

_No response_

### Actual behavior

No signs are placed in `fugitive://` (and potentially `gitsigns://`) buffers.

### Minimal config

```Lua
If necessary, I can provide.
```

### Steps to reproduce

Open a `fugitive://` or `gitsigns://` buffer (such as with `:0Gclog`) and notice lack of signs.

### Gitsigns debug messages

```text

```

### Gitsigns cache

```lua

```

	local rev_from_index = not git_obj:from_tree()
	local buf_is_editable_file = vim.bo[bufnr].buftype == ''

	if
	config.signs_staged_enable
	and not file_mode
	and (rev_from_index or not buf_is_editable_file)
	then
	if not bcache.compare_text_head or config._refresh_staged_on_update then
	-- When the revision is from the index, we compare against HEAD to
	-- show the staged changes.
	--
	-- When showing a revision buffer (a buffer that represents the revision
	-- of a specific file and does not have a corresponding file on disk), we
	-- utilize the staged signs to represent the changes introduced in that
	-- revision. Therefore we compare against the previous commit. Note there
	-- should not be any normal signs for these buffers.
	local staged_rev = rev_from_index and 'HEAD' or git_obj.revision .. '^'

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staged signs no longer work for vim-fugitive index buffers #1182

Description

Neovim version

Operating system and version

Expected behavior

Actual behavior

Minimal config

Steps to reproduce

Gitsigns debug messages

Gitsigns cache

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Uh oh!

staged signs no longer work for vim-fugitive index buffers #1182

Description

Description

Neovim version

Operating system and version

Expected behavior

Actual behavior

Minimal config

Steps to reproduce

Gitsigns debug messages

Gitsigns cache

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

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