Applications+DevTools+MenuApplets: Drop "unix" pledge when possible

Now that the "unix" pledge is no longer required for socket I/O, we can
drop it after making the connections we need in a program.

In most GUI program cases, once we've connected to the WindowServer by
instantiating a GApplication, we no longer need "unix" :^)

DevTools/HackStudio/main.cpp

@@ -103,6 +103,11 @@ int main(int argc, char** argv)
 
     GApplication app(argc, argv);
 
+    if (pledge("stdio tty rpath cpath wpath shared_buffer proc fattr", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
     Function<void()> update_actions;
 
     g_window = GWindow::construct();