haskellPackages.yi-language: use fetchpatch's `relative` argument

We can drop `includes` since there's only one file in that directory.

pkgs/development/haskell-modules/configuration-common.nix

@@ -1818,10 +1818,8 @@ self: super: {
   # Presumably to be removed at the next release
   yi-language = appendPatch (pkgs.fetchpatch {
     url = "https://github.com/yi-editor/yi/commit/0d3bcb5ba4c237d57ce33a3dc39b63c56d890765.patch";
-    sha256 = "0r4mzngs0x1akqpajzx7ssa9rax977fvj5ra8d3grfbpx6z0nm01";
-    includes = [ "yi-language.cabal" ];
-    stripLen = 2;
-    extraPrefix = "";
+    relative = "yi-language";
+    sha256 = "sha256-AVQLvul3ufxGQyoXud05qauclNanf6kunip0oJ/9lWQ=";
   }) super.yi-language;
 
   # https://github.com/ghcjs/jsaddle/issues/123