Remove 'Destructive' prompts (#11631)

While these would match how macOS handles this scenario, they crash on
Catalina, and require mouse clicks to interact.

cc @bennetbo



Release Notes:

- N/A

crates/gpui/src/platform/windows/window.rs

@@ -437,7 +437,7 @@ impl PlatformWindow for WindowsWindow {
                             title = windows::core::w!("Warning");
                             main_icon = TD_WARNING_ICON;
                         }
-                        crate::PromptLevel::Critical | crate::PromptLevel::Destructive => {
+                        crate::PromptLevel::Critical => {
                             title = windows::core::w!("Critical");
                             main_icon = TD_ERROR_ICON;
                         }