kitty: make possible to override goModules

go-modules name had to be changed to goModules so it becomes a env
var (bash vars can't contain -)

enables overriding the build without overriding configurePhase

```
pkgs.kitty.overrideAttrs (finalAttrs: previousAttrs: {
  name = "kitty-master";
  version = "master";
  src = pkgs.fetchFromGitHub {
    owner = "kovidgoyal";
    repo = "kitty";
    rev = "66a2efd191f98a1a5b3c2d4fdc9569204b445a2f";
    sha256 = "sha256-pJuhnJOjGBflHXOOYKrg9/e3c+VGEESZtfka84ARCd4=";
  };
  goModules = (pkgs.buildGoModule {
    pname = "kitty-go-modules";
    inherit (finalAttrs) src version;
    vendorHash = "sha256-eAovZ/7JnvXlnlFyt0skhYJ1Nrzy2XCpRlQvSmWCyaY=";
  }).go-modules;
})
```

1 files changed, 2 insertions, 2 deletions

diff --git a/pkgs/applications/terminal-emulators/kitty/default.nix b/pkgs/applications/terminal-emulators/kitty/default.nix
index e693e51c9360a..ea7fc0e3e71e4 100644
--- a/pkgs/applications/terminal-emulators/kitty/default.nix
+++ b/pkgs/applications/terminal-emulators/kitty/default.nix
@@ -100,7 +100,7 @@ buildPythonApplication rec {
   CGO_ENABLED = 0;
   GOFLAGS = "-trimpath";
 
-  go-modules = (buildGoModule {
+  goModules = (buildGoModule {
     pname = "kitty-go-modules";
     inherit src vendorHash version;
   }).go-modules;
@@ -109,7 +109,7 @@ buildPythonApplication rec {
     export GOCACHE=$TMPDIR/go-cache
     export GOPATH="$TMPDIR/go"
     export GOPROXY=off
-    cp -r --reflink=auto ${go-modules} vendor
+    cp -r --reflink=auto $goModules vendor
   '';
 
   buildPhase = let