AudioServer: Drop "rpath" and "wpath" pledges

Once the event loop is constructed, we will have opened /dev/audio for
output and no more filesystem lookups need to happen.

Servers/AudioServer/main.cpp

@@ -35,9 +35,10 @@ int main(int, char**)
  return 1;
  }
  ASEventLoop event_loop;
- if (pledge("stdio thread shared_buffer accept rpath wpath", nullptr) < 0) {
+ if (pledge("stdio thread shared_buffer accept", nullptr) < 0) {
  perror("pledge");
  return 1;
  }
+
  return event_loop.exec();
 }