console logger: Fix undefined variable or method block

[prahal]

Fixes #805 .

replace yield if block which is incorrect at least nowadays by yield if block_given?.

REDMINE_INSTANCE=default bundle exec rake redmine_git_hosting:install_hook_files                         
                                                    
 * Installing/updating Gitolite hooks:
rake aborted!                                       
NameError: undefined local variable or method `block' for RedmineGitHosting::ConsoleLogger:Module
/usr/share/redmine/plugins/redmine_git_hosting/lib/redmine_git_hosting/console_logger.rb:9:in `title'    
/usr/share/redmine/plugins/redmine_git_hosting/lib/tasks/redmine_git_hosting.rake:71:in `block (2 levels) in <top (required)>'                                                                                     
/usr/share/rubygems-integration/all/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'                   
Tasks: TOP => redmine_git_hosting:install_hook_files                                                     
(See full trace by running task with --trace)

[PowerKiKi]

Thank you for your work so far. It has been superseded by #815