Start new session after crash now properly works

Hi, it's me again!
After a Falkon crash, a restore session screen is presented. If we choose to start a new session, the window closes itself and nothing happens.
This fixes this problem, however I'm not familiar with the codebase and I might have missed something. Please let me know if this works for you.

P.S. only way I found to test this is to set m_isStartingAfterCrash = true; in mainapplication.cpp, line 322.