refactor(test/spring/test-data.properties): remove unused valid_category_name_ru property.

Should be in 5610456 commit.

No functional changes.

Author: php-coder

src/main/resources/test/spring/test-data.properties

@@ -22,12 +22,6 @@ valid_country_name_en = Italy
 # ATTENTION: must be encoded by native2asscii (MRESOURCES-175)
 valid_country_name_ru = \u0418\u0442\u0430\u043b\u0438\u044f
 
-# this category should always exist
-# (used in WhenUserAddSeries, src/test/robotframework/category/creation/validation.robot and
-# src/test/robotframework/series/creation/misc-admin.robot)
-# ATTENTION: must be encoded by native2asscii (MRESOURCES-175)
-valid_category_name_ru = \u0421\u043f\u043e\u0440\u0442
-
 # this privileged user should always exist
 valid_admin_login = admin
 valid_admin_password = test