Fixes:
- The field name typo is fixed for `ex.relative_filename`;
- Outdated nerd font icon for disabled LSP client is updated;
- The *committed* color is used in the `ex.git.branch` component for an unchanged working tree,
instead of the *disabled* color. This was broken after the change in plenary:
https://github.com/nvim-lua/plenary.nvim/commit/3707cdb1e43f5cea73afb6037e6494e7ce847a66.