Fix LeakyConstantDeclaration RuboCop offense

src/api/spec/lib/backend/remember_location_spec.rb

@@ -1,14 +1,14 @@
 require 'rails_helper'
 
 RSpec.describe Backend::RememberLocation do
-  let(:mod) { WithRememberLocation }
+  let(:mod) do
+    Class.new(WithRememberLocation) do
+      extend Backend::RememberLocation
 
-  class WithRememberLocation
-    extend Backend::RememberLocation
-
-    def self.run
-      raise 'Backend module missing' unless Thread.current[:_influxdb_obs_backend_api_module] == 'WithRememberLocation'
-      raise 'Backend method missing' unless Thread.current[:_influxdb_obs_backend_api_method] == 'run'
+      def self.run
+        raise 'Backend module missing' unless Thread.current[:_influxdb_obs_backend_api_module] == 'WithRememberLocation'
+        raise 'Backend method missing' unless Thread.current[:_influxdb_obs_backend_api_method] == 'run'
+      end
     end
   end