init: Remove incorrect comment about shutdown condition

Shutdown is indeed called, and it being overkill does not make sense
either.

src/init.cpp

@@ -1662,7 +1662,6 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
 
     // As LoadBlockIndex can take several minutes, it's possible the user
     // requested to kill the GUI during the last operation. If so, exit.
-    // As the program has not fully started yet, Shutdown() is possibly overkill.
     if (ShutdownRequested(node)) {
         LogPrintf("Shutdown requested. Exiting.\n");
         return false;