Add an option to abort when a panic alert occurs

Prompted by https://dolphin.ci/#/builders/24/builds/985

A 1-character typo in a recent PR caused FifoCI builds to break
horribly and spew millions of panic alerts until buildbot crashed.

This PR adds a new config option -- defaulting to off -- that allows
Dolphin to abort early on when a panic alert occurs instead of
continuing forever.

Source/Core/UICommon/UICommon.cpp

@@ -102,6 +102,7 @@ void Init()
   VideoBackendBase::ActivateBackend(Config::Get(Config::MAIN_GFX_BACKEND));
 
   Common::SetEnableAlert(Config::Get(Config::MAIN_USE_PANIC_HANDLERS));
+  Common::SetAbortOnPanicAlert(Config::Get(Config::MAIN_ABORT_ON_PANIC_ALERT));
 }
 
 void Shutdown()