test: fix Time.now date comparison in test (#413)

Author: jeffladiray

test/services/forest_liana/resources_getter_test.rb

@@ -106,7 +106,7 @@ class ResourcesGetterTest < ActiveSupport::TestCase
           conditions: [{
             field: 'created_at',
             operator: 'after',
-            value: '2015-06-18 08:00:00',
+            value: "#{Time.now.year - 5}-06-18 08:00:00",
           }, {
             field: 'owner:name',
             operator: 'equal',