gpui: Remove debug print statement (#17878)

Release Notes:

- N/A

crates/gpui/src/app.rs

@@ -1504,9 +1504,3 @@ pub struct KeystrokeEvent {
     /// The action that was resolved for the keystroke, if any
     pub action: Option<Box<dyn Action>>,
 }
-
-impl Drop for AppContext {
-    fn drop(&mut self) {
-        println!("Dropping the App Context");
-    }
-}