Fix failure to detect string scope, and disable quote autoclose in Rust (#2862)

This regressed in https://github.com/zed-industries/zed/pull/2723
Fixes https://github.com/zed-industries/community/issues/684
Fixes
https://linear.app/zed-industries/issue/Z-1516/avoid-double-quotes-when-closing-a-string

Release Notes:

- Fixed a bug where auto-closing quotation marks were inserted
incorrectly in Rust.
e48bb1853cMax Brunsfeld committed on 8/18/2023, 9:39:44 PM· committed by GitHubparents98186fc1c46749
3 files changedLine totals unavailable