* Staking e2e test - case when ledger active balance falls below ED

* Update frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs

Co-authored-by: Ankan <10196091+Ank4n@users.noreply.github.com>

* Simplifies test assertions; tests events

---------

Co-authored-by: Ankan <10196091+Ank4n@users.noreply.github.com>
Co-authored-by: parity-processbot <>