Make scripts/histogram ignore lines without frame duration

Previously the script would choke on lines generated, for example, by
`cargo run`.

This just skips lines that don't contain `frame duration:`.

Co-authored-by: Antonio <antonio@zed.dev>
0db9c274aaThorsten Ball committed on 1/23/2024, 12:52:55 PMparent4cccb4e
1 file changedLine totals unavailable