inline assistant: Do not dismiss while generating when hitting enter (#32810)

Closes #32798

Release Notes:

- Fixed an issue where the inline assistant would be dismissed when
hitting enter while generating code

crates/agent/src/inline_assistant.rs

@@ -765,9 +765,6 @@ impl InlineAssistant {
             PromptEditorEvent::CancelRequested => {
                 self.finish_assist(assist_id, true, window, cx);
             }
-            PromptEditorEvent::DismissRequested => {
-                self.dismiss_assist(assist_id, window, cx);
-            }
             PromptEditorEvent::Resized { .. } => {
                 // This only matters for the terminal inline assistant
             }