style(migrations): removed double brackets (#5309)

lib/tasks/migrations/migrations.rake

@@ -168,7 +168,7 @@ namespace :migrations do
         puts red "Unable to migrate Room:"
         puts yellow "UID: #{r.uid}"
         puts yellow "Name: #{params[:room][:name]}"
-        puts yellow "Provider: #{params[:room][:provider]}}"
+        puts yellow "Provider: #{params[:room][:provider]}"
         puts red "Errors: #{JSON.parse(response.body.to_s)['errors']}"
         has_encountred_issue = 1 # At least one of the migrations failed.
       end