[Bug]: Bufferline don't show overidden icons which are set by nvim-web-devicons

### What happened?

```lua
local devicons = require('nvim-web-devicons')

local override = {
["spec.ts"] = {
icon = "",
color = "#ffc600",
name = "TsTest",
},
}
devicons.setup {
override = override,
default = true,
}
```

### What did you expect to happen?

```lua
-- Test config
print(vim.inspect(devicons.get_icon('test.component.spec.ts'))) -- print: 
```

### Additional Information

[nvim-web-devicons config](https://github.com/kyazdani42/nvim-tree.lua/pull/423#issue-658556199)

### commit

_No response_