temporary fix for tests

[benryan1790]

Fixing failing tests due to tax year.

Bug fix

Fixing tests so https://github.com/hmrc/claim-tax-refund-frontend/pull/456 can be merged. Tests will need a proper refactor at some point.

Checklist

• [x] I've made every effort to commit high quality, clean code and I have executed relevant static analyses to be sure
• [x] I've included appropriate tests with any code I've added (Unit, Integration, Acceptance etc.)
• [x] I've executed the acceptance test pack locally to ensure there are no functional regressions
• [x] I've added my code using logical, atomic commits, squashing as appropriate - including the JIRA issue number in the commit message
• [x] I've run a dependency check to ensure all dependencies are up to date

[benryan1790]

Unit tests started failing due to Tax Year roll over. This is a quick fix so that https://github.com/hmrc/claim-tax-refund-frontend/pull/456 can be merged, which itself is a fix for a potential live issue. The tests will need properly refactoring at some point to future-proof and prevent them failing next tax year.