bug(more): when -n is a max number of u16 date type, more panics

Hi, uutils mainteners

that is an overflow issue with the more utility, as you can see

```rust
relunsec@relunsec:~/software/coreutils/target/debug$ ./more -n 65535
panicked at src/uu/more/src/more.rs:126:61:
attempt to add with overflow
relunsec@relunsec:~/software/coreutils/target/debug$ 
```

it panics just using the max value of the the type because it tries to add after 65535 and panics