Remove unnecessary realpath

MSP-11153

Causes errors on machines that don't have ~/.msf4 like travis-ci.

lib/metasploit/framework/database.rb

@@ -96,7 +96,7 @@ module Metasploit
       # @return [Pathname] if the user has a `database.yml` in their config directory (`~/.msf4` by default).
       # @return [nil] if the user does not have a `database.yml` in their config directory.
       def self.user_configurations_pathname
-        Pathname.new(Msf::Config.get_config_root).realpath.join('database.yml')
+        Pathname.new(Msf::Config.get_config_root).join('database.yml')
       end
     end
   end