himalaya-vim: fix broken build

I think something about the build for Vim plugins has changed that made
this build break. Moving the fixup step up to configure made it build
again on my local machine.

pkgs/misc/vim-plugins/overrides.nix

@@ -51,7 +51,7 @@
 , CoreFoundation
 , CoreServices
 
-# nvim-treesitter dependencies
+  # nvim-treesitter dependencies
 , tree-sitter
 
   # sved dependencies
@@ -66,7 +66,7 @@
 , openssl
 , pkg-config
 
-# vim-go dependencies
+  # vim-go dependencies
 , asmfmt
 , delve
 , errcheck
@@ -86,7 +86,7 @@
 , iferr
 , impl
 , reftools
-# must be lua51Packages
+  # must be lua51Packages
 , luaPackages
 }:
 
@@ -311,13 +311,9 @@ self: super: {
     pname = "himalaya-vim";
     inherit (himalaya) src version;
     dependencies = with self; [ himalaya ];
-    patchPhase = ''
-      rm -rf !"vim/"
-      cp -vaR vim/. .
-      rm -rf vim/
-    '';
-    preFixup = ''
-      substituteInPlace $out/share/vim-plugins/himalaya-vim/plugin/himalaya.vim \
+    configurePhase = ''
+      cd vim
+      substituteInPlace plugin/himalaya.vim \
         --replace 'if !executable("himalaya")' 'if v:false'
     '';
     postFixup = ''