home: vim: git: fix deprecated functions

I don't make use of their non-upstreamed functionality.

modules/home/vim/default.nix

@@ -48,11 +48,7 @@ in
       vim-unimpaired # Some ex command mappings
 
       # Languages
-      rust-vim
       vim-beancount
-      vim-jsonnet
-      vim-nix
-      vim-toml
 
       # General enhancements
       vim-qf # Better quick-fix list

modules/home/vim/plugin/settings/git.lua

@@ -54,8 +54,8 @@ local keys = {
         s = { gitsigns.stage_hunk, "Stage hunk" },
         S = { gitsigns.stage_buffer, "Stage buffer" },
         u = { gitsigns.undo_stage_hunk, "Undo stage hunk" },
-        ["["] = { gitsigns.prev_hunk, "Previous hunk" },
-        ["]"] = { gitsigns.next_hunk, "Next hunk" },
+        ["["] = { utils.partial(gitsigns.nav_hunk, "prev"), "Previous hunk" },
+        ["]"] = { utils.partial(gitsigns.nav_hunk, "next"), "Next hunk" },
     },
 }