Remove needless string interpolation
Remove needless string interpolation

It was added in a just merged PR:
https://github.com/ManageIQ/manageiq-ui-classic/pull/8429

There is no need for interpolation here.

Fixes a brakeman warning:

Confidence: Medium
Category: SQL Injection
Check: SQL
Message: Possible SQL injection
Code: fcb97b36cb1125b010444938b7060d23149ebfda@ems_id}")
File: ../../.gem/ruby/2.7.6/bundler/gems/manageiq-ui-classic-dd7330eae02e/app/services/ems_storage_dashboard_service.rb
Line: 102

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic