settings: Fix inverted VS Code import for files.simpleDialog.enable (#55678)

Seems to have been introduced in
1fbe1e3512.
These settings actually mean the opposite:

> Whether to use the system provided dialogs for Open and Save As. When
set to false, Zed will use the built-in keyboard-first pickers.

> Enables the simple file dialog for opening and saving files and
folders. The simple file dialog replaces the system file dialog when
enabled.

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

~~Closes #ISSUE~~

Release Notes:

- Fixed import of VSCode setting `files.simpleDialog.enable` being
inverted

crates/settings/src/vscode_import.rs

@@ -1035,7 +1035,7 @@ impl VsCodeSettings {
             restore_on_startup: None,
             window_decorations: None,
             show_call_status_icon: None,
-            use_system_path_prompts: self.read_bool("files.simpleDialog.enable"),
+            use_system_path_prompts: self.read_bool("files.simpleDialog.enable").map(|b| !b),
             use_system_prompts: None,
             use_system_window_tabs: self.read_bool("window.nativeTabs"),
             when_closing_with_no_tabs: self.read_bool("window.closeWhenEmpty").map(|b| {