gdscript-formatter: fix hash, remove .git from src

Before this, rebuilding `src` multiple times sometimes resulted in
different hashes due to differences in `.git`.

Hydra: https://hydra.nixos.org/build/319210955

pkgs/by-name/gd/gdscript-formatter/package.nix

@@ -14,9 +14,11 @@ rustPlatform.buildRustPackage (finalAttrs: {
     owner = "GDQuest";
     repo = "GDScript-formatter";
     tag = finalAttrs.version;
-    hash = "sha256-nnLVmd7wVHdDcAnyCHCVYckmbzMdSGIVL2iSgDC+9cs=";
+    hash = "sha256-V9zrL2Aku5e+9McXpXdXvsGJKjqVXIIaAsoAF2xHB4g=";
     # Needed due to .gitattributes being used for the Godot addon and export-ignoring all files
     deepClone = true;
+    # Avoid hash differences due to differences in .git
+    leaveDotGit = false;
   };
 
   cargoHash = "sha256-xqGmv/e1Ch/EqutIb2claiJ8fQGDDdOriOZdt8SR8mw=";