Minor clean up of extra given? method (#726)

Author: abitrolly

lib/database_cleaner/safeguard.rb

@@ -45,15 +45,11 @@ class RemoteDatabaseUrl
 
       def run
         return if skip?
-        raise Error::RemoteDatabaseUrl if given?
+        raise Error::RemoteDatabaseUrl if remote?(ENV['DATABASE_URL'])
       end
 
       private
 
-        def given?
-          remote?(ENV['DATABASE_URL'])
-        end
-
         def remote?(url)
           return false unless url
           parsed = URI.parse(url)