Everywhere: Core dump => Coredump

We all know what a coredump is, and it feels more natural to refer to
it as a coredump (most code already does), so let's be consistent.

Kernel/Thread.cpp

@@ -890,7 +890,7 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
             set_state(Stopped, signal);
             return DispatchSignalResult::Yield;
         case DefaultSignalAction::DumpCore:
-            process.set_dump_core(true);
+            process.set_should_generate_coredump(true);
             process.for_each_thread([](auto& thread) {
                 thread.set_dump_backtrace_on_finalization();
             });