utils/github: set default args to search_code

Library/Homebrew/test/utils/github_spec.rb

@@ -7,7 +7,7 @@ describe GitHub do
   describe "::search_code", :needs_network do
     it "queries GitHub code with the passed parameters" do
       results = described_class.search_code(repo: "Homebrew/brew", path: "/",
-                                            filename: "readme", language: "markdown")
+                                            filename: "readme", extension: "md")
 
       expect(results.count).to eq(1)
       expect(results.first["name"]).to eq("README.md")

Library/Homebrew/utils/github.rb

@@ -52,8 +52,8 @@ module GitHub
     API.open_rest(url_to("repos", user, repo))
   end
 
-  def search_code(**qualifiers)
-    matches = search("code", **qualifiers)
+  def search_code(repo: nil, user: "Homebrew", path: ["Formula", "Casks", "."], filename: nil, extension: "rb")
+    matches = search("code", user: user, path: path, filename: filename, extension: extension, repo: repo)
     return matches if matches.blank?
 
     matches.map do |match|