Fix fake_function_collection_spec

spec/lib/metasploit/framework/obfuscation/crandomizer/code_factory/fake_function_collection_spec.rb

@@ -29,8 +29,7 @@ RSpec.describe Metasploit::Framework::Obfuscation::CRandomizer::CodeFactory::Fak
   describe '#to_s' do
     it 'converts function objects to a string' do
       str = subject.to_s
-      expect(str).to match(/function/)
-      expect(str).to match(/return/)
+      expect(str).to match(/function\d+.+\(.*\)\s*{.*}/)
     end
   end