Move input packet debug prints off the control stream thread

The control stream thread is extremely performance-sensitive.

src/input.cpp

@@ -1103,6 +1103,9 @@ namespace input {
       }
     }
 
+    // Print the final input packet
+    input::print((void *) payload);
+
     // Send the batched input to the OS
     switch (util::endian::little(payload->magic)) {
       case MOUSE_MOVE_REL_MAGIC_GEN5: