Release Notes:

- N/A

Just make a simple change to avoid crash.

```
thread 'main' panicked at library\std\src\time.rs:436:33:
overflow when subtracting duration from instant
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library\std\src\panicking.rs:697
   1: core::panicking::panic_fmt
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library\core\src\panicking.rs:75
   2: core::panicking::panic_display
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library\core\src\panicking.rs:261
   3: core::option::expect_failed
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library\core\src\option.rs:2024
   4: core::option::Option::expect
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library\core\src\option.rs:933
   5: std::time::impl$3::sub
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library\std\src\time.rs:436
   6: data_table::Quote::random
             at .\crates\gpui\examples\data_table.rs:54
```