Fix extra space added in beginning of commit message

Removes extra space in merge commit messages. This seems to have been
introduced by the functionality added in 38d8d749 which allows a user
to change a merge commit message.

lib/gitlab/satellite/merge_action.rb

@@ -118,7 +118,7 @@ module Gitlab
 
         # merge the source branch into the satellite
         # will raise CommandFailed when merge fails
-        repo.git.merge(default_options({no_ff: true}), "-m #{message}", "source/#{merge_request.source_branch}")
+        repo.git.merge(default_options({no_ff: true}), "-m#{message}", "source/#{merge_request.source_branch}")
       rescue Grit::Git::CommandFailed => ex
         handle_exception(ex)
       end