ssh: Clean up title bar indicator icon (#19328)

This PR cleans up the custom icon with indicator implementation in favor
of `IconWithIndicator`, which we already had. It seems like it isn't
super used still, but it's good to try to enforce some consistency
either way. I checked my changes against the REPL stuff (one instance
where its used) and everything's looking good so far. As far as SSH,
nothing has visually changed; we just have less code for this thing now.

<img width="800" alt="Screenshot 2024-10-17 at 2 15 47 AM"
src="https://github.com/user-attachments/assets/5c146757-501e-4242-b145-a576a8f289b5">

---

Release Notes:

- N/A

crates/ui/src/components/icon.rs

@@ -473,13 +473,12 @@ impl RenderOnce for IconWithIndicator {
                 this.child(
                     div()
                         .absolute()
-                        .w_2()
-                        .h_2()
-                        .border_1()
+                        .size_2p5()
+                        .border_2()
                         .border_color(indicator_border_color)
                         .rounded_full()
                         .bottom_neg_0p5()
-                        .right_neg_1()
+                        .right_neg_0p5()
                         .child(indicator),
                 )
             })