Add integration test to check that prices accept a decimal comma

[0pdd]

The puzzle 1513-5b274200 from #1513 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/support/spring/mvc/BigDecimalConverter.java

Line 30 in 49d59b6

// @todo #1513 Add integration test to check that prices accept a decimal comma

The puzzle was created by Slava Semushin on 14-Feb-21.