correct rubocop offence

correct rubocop offence
From 16b5f259094f87c2e111ab53ab950a5511dabb49 Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Mon, 10 Dec 2018 14:07:09 +1100
Subject: [PATCH] correct rubocop offence


diff --git a/lib/mini_profiler/storage/file_store.rb b/lib/mini_profiler/storage/file_store.rb
index 26238ac..74e35e0 100644
--- a/lib/mini_profiler/storage/file_store.rb
+++ b/lib/mini_profiler/storage/file_store.rb
@@ -33,7 +33,7 @@ module Rack
         private
         if RUBY_PLATFORM =~ /mswin(?!ce)|mingw|cygwin|bccwin/
           def path(key)
-            @path.dup << "/" << @prefix  << "_" << key.gsub(/:/, '_')
+            @path.dup << "/" << @prefix << "_" << key.gsub(/:/, '_')
           end
         else
           def path(key)

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