Userland: Tighten a *lot* of pledges! :^)

Since applications using Core::EventLoop no longer need to create a
socket in /tmp/rpc/, and also don't need to listen for incoming
connections on this socket, we can remove a whole bunch of pledges!

Userland/Shell/main.cpp

@@ -42,7 +42,7 @@ int main(int argc, char** argv)
     });
 
 #ifdef __serenity__
-    if (pledge("stdio rpath wpath cpath proc exec tty accept sigaction unix fattr", nullptr) < 0) {
+    if (pledge("stdio rpath wpath cpath proc exec tty sigaction unix fattr", nullptr) < 0) {
         perror("pledge");
         return 1;
     }