fix: event invoice fetched correctly in review route

[shreyanshdwivedi]

Fixes #3411

Short description of what this resolves:

Currently, we use filter to get a particular event invoice. Also we are not redirecting request from review to paid even if it is paid

Changes proposed in this pull request:

• fix event invoice query
• fix redirection of event invoice
• made minor changes to review page

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[uds5501]

LGTM