[Command] Also disable colored2 when ansi output is disabled

lib/cocoapods/command.rb

@@ -87,6 +87,7 @@ module Pod
       config.silent = argv.flag?('silent', config.silent)
       config.verbose = self.verbose? unless verbose.nil?
       unless self.ansi_output?
+        Colored2.disable!
         String.send(:define_method, :colorize) { |string, _| string }
       end
     end