Fix exiting when running some payloads (like the nand dumper)

Dockerfile

@@ -1,3 +1,3 @@
-FROM ghcr.io/wiiu-env/devkitppc:20240423
+FROM ghcr.io/wiiu-env/devkitppc:20240505
 
 WORKDIR project

src/main.cpp

@@ -123,6 +123,7 @@ extern "C" int _start(int argc, char **argv) {
     if (entryPoint != 0) {
         res = ((int (*)(int, char **)) entryPoint)(argc, argv);
     }
+    _Exit(0);
     return res;
 }