gitstatus: patch fewer characters

This is a followup to NixOS#76744.

The patch is still too aggressive because it captures additional local
variables declared in the same line. It should stop when it hits
whitespace.

See romkatv/gitstatus#92.

pkgs/applications/version-management/git-and-tools/gitstatus/default.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation {
 
   buildInputs = [ (callPackage ./romkatv_libgit2.nix {}) ];
   patchPhase = ''
-    sed -i "s|local daemon=.*|local daemon=$out/bin/gitstatusd|" gitstatus.plugin.zsh
+    sed -i "s|local daemon=\S*|local daemon=$out/bin/gitstatusd|" gitstatus.plugin.zsh
   '';
   installPhase = ''
     install -Dm755 gitstatusd $out/bin/gitstatusd