exceptions: don't bracket url

Closes Homebrew/homebrew#41592.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Library/Homebrew/exceptions.rb

@@ -216,7 +216,7 @@ class BuildError < RuntimeError
     puts
     unless RUBY_VERSION < "1.8.7" || issues.empty?
       puts "These open issues may also help:"
-      puts issues.map{ |i| "#{i['title']} (#{i['html_url']})" }.join("\n")
+      puts issues.map{ |i| "#{i['title']} #{i['html_url']}" }.join("\n")
     end
 
     if MacOS.version >= "10.11"