Fix main: clippy on Rust 1.100 stops at shortcuts.rs and the CLI script tests (#2316)

Rust 1.100 marks `ExitCode` as must-use and extends `needless_bool`,
so `cargo clippy --workspace --all-targets -- -D warnings` fails on main:

- `crates/ui-egui/src/shortcuts.rs`: the end of `key_event` returns the
  condition directly instead of `if ... { return true; } false`.
- `apps/figcraft-cli/src/files.rs`: three script tests now assert the exit
  code that `run_script` returns (`SUCCESS` for the two scripts that run,
  1 for the script whose step fails) instead of dropping it.

apps/figcraft-cli/src/files.rs

@@ -670,7 +670,7 @@ mod tests {
         )
         .unwrap();
         let out = dir.join("out.figcraft");
-        run_script(script.to_str().unwrap(), None, Some(out.to_str().unwrap())).unwrap();
+        assert_eq!(run_script(script.to_str().unwrap(), None, Some(out.to_str().unwrap())).unwrap(), ExitCode::SUCCESS);
 
         let mut s = Session::empty();
         s.execute("file.open", &json!({"path": out.to_str().unwrap()})).unwrap();
@@ -700,7 +700,7 @@ mod tests {
         )
         .unwrap();
         let out = dir.join("out.figcraft");
-        run_script(script.to_str().unwrap(), None, Some(out.to_str().unwrap())).unwrap();
+        assert_eq!(run_script(script.to_str().unwrap(), None, Some(out.to_str().unwrap())).unwrap(), ExitCode::SUCCESS);
 
         let mut s = Session::empty();
         s.execute("file.open", &json!({"path": out.to_str().unwrap()})).unwrap();
@@ -737,7 +737,7 @@ mod tests {
         .unwrap();
         let out = dir.join("out.figcraft");
         // The failure is the script's, not the call's: the CLI reports it and exits non-zero.
-        run_script(script.to_str().unwrap(), None, Some(out.to_str().unwrap())).unwrap();
+        assert_eq!(run_script(script.to_str().unwrap(), None, Some(out.to_str().unwrap())).unwrap(), ExitCode::from(1));
         assert!(!out.exists(), "a script that failed writes nothing");
         std::fs::remove_dir_all(dir).unwrap();
     }

crates/ui-egui/src/shortcuts.rs

@@ -521,10 +521,7 @@ fn key_event(app: &mut FigApp, key: Key, physical: Option<Key>, m: Modifiers, re
         }
         return true;
     }
-    if m.is_none() && !repeat && opacity_digit(app, key, now) {
-        return true;
-    }
-    false
+    m.is_none() && !repeat && opacity_digit(app, key, now)
 }
 
 /// Keys while a selection box drawn from the keyboard shows (`select.area`, Alt+Space or Ctrl+Space,