Fix Performance/HashEachMethods offenses

values.each and keys.each methods are depreciated, so they have replaced by
each_value and each_key respectively. This has done manually.

Closes https://github.com/openSUSE/osem/issues/1825

app/helpers/application_helper.rb

@@ -99,7 +99,7 @@ module ApplicationHelper
   end
 
   def normalize_array_length(hashmap, length)
-    hashmap.each do |_, value|
+    hashmap.each_value do |value|
       if value.length < length
         value.fill(value[-1], value.length...length)
       end