fixes issues for mr acceptance

app/models/repository.rb

@@ -748,8 +748,8 @@ class Repository
         update: options[:update]
       }
 
-      if commit_options[:previous_path]
-        commit_options[:file].merge!(previous_path: commit_options[:previous_path])
+      if options[:previous_path]
+        commit_options[:file][:previous_path] = options[:previous_path]
 
         Gitlab::Git::Blob.rename(raw_repository, commit_options)
       else