Fix passphrase should expire in in_memory_pass_phrase_session_length mock test issue

[ioanmo226]

This test sometimes fails with below error.
Need to fix.

✖ user@passphrase-session-length-client-configuration.flowcrypt.test - passphrase should expire in in_memory_pass_phrase_session_length [ALL RETRIES FAILED for user@passphrase-session-length-client-configuration.flowcrypt.test - passphrase should expire in in_memory_pass_phrase_session_length]
ℹ (attempt 1 of 3) Retrying: AssertionError: expected undefined to equal '1234'
ℹ (attempt 2 of 3) Retrying: AssertionError: expected undefined to equal '1234'
ℹ (attempt 3 of 3) Failed: /home/semaphore/git/flowcrypt-browser/test/source/tests/setup.ts:853
expect(savedPassphrase).to.be.equal(passphrase);

  AssertionError: expected undefined to equal '1234'
      at <anonymous> (/home/semaphore/git/flowcrypt-browser/test/source/tests/setup.ts:853:37)
      at <anonymous> (/home/semaphore/git/flowcrypt-browser/test/source/test.ts:76:7)
      at <anonymous> (/home/semaphore/git/flowcrypt-browser/test/source/browser/browser-pool.ts:144:61)
      at <anonymous> (/home/semaphore/git/flowcrypt-browser/test/source/test.ts:71:5)
      at <async> <anonymous> (/test/source/tests/setup.ts:832:180)
      at <async> <anonymous> (../test/source/test.ts:71:53)
      at <async> <anonymous> (/test/source/browser/browser-pool.ts:144:49)