Remove the file session.rs in crate/zed which is no longer used (#15394)

Michael Angerman created 

There was an empty file *session.rs* in the crate zed which was empty so
I am going ahead and removing it...

Release Notes:

- N/A

Change summary

crates/zed/src/zed.rs         | 1 -
crates/zed/src/zed/session.rs | 1 -
2 files changed, 2 deletions(-)

Detailed changes

crates/zed/src/zed.rs 🔗 

@@ -5,7 +5,6 @@ pub(crate) mod linux_prompts;
 #[cfg(not(target_os = "linux"))]
 pub(crate) mod only_instance;
 mod open_listener;
-pub(crate) mod session;
 
 pub use app_menus::*;
 use breadcrumbs::Breadcrumbs;