Make tab close button square (#4052)

This PR makes the close button for tabs square.

`IconButton` now accepts a `shape`, and using `IconButtonShape::Square`
will ensure the `IconButton` is square with respect to its contained
icon.

#### Before

<img width="119" alt="Screenshot 2024-01-15 at 10 32 40 AM"
src="https://github.com/zed-industries/zed/assets/1486634/dc806b9b-411f-4cd9-8c10-676d2cbd298b">

#### After

<img width="116" alt="Screenshot 2024-01-15 at 10 32 24 AM"
src="https://github.com/zed-industries/zed/assets/1486634/8b4ef43c-14b6-449f-a235-5d7affd82c4e">

Release Notes:

- Changed the tab close button to be square.

crates/ui/src/components/button/button_like.rs

@@ -300,6 +300,7 @@ pub struct ButtonLike {
     pub(super) selected: bool,
     pub(super) selected_style: Option<ButtonStyle>,
     pub(super) width: Option<DefiniteLength>,
+    pub(super) height: Option<DefiniteLength>,
     size: ButtonSize,
     rounding: Option<ButtonLikeRounding>,
     tooltip: Option<Box<dyn Fn(&mut WindowContext) -> AnyView>>,
@@ -317,6 +318,7 @@ impl ButtonLike {
             selected: false,
             selected_style: None,
             width: None,
+            height: None,
             size: ButtonSize::Default,
             rounding: Some(ButtonLikeRounding::All),
             tooltip: None,
@@ -325,6 +327,11 @@ impl ButtonLike {
         }
     }
 
+    pub(crate) fn height(mut self, height: DefiniteLength) -> Self {
+        self.height = Some(height);
+        self
+    }
+
     pub(crate) fn rounding(mut self, rounding: impl Into<Option<ButtonLikeRounding>>) -> Self {
         self.rounding = rounding.into();
         self
@@ -417,7 +424,7 @@ impl RenderOnce for ButtonLike {
             .id(self.id.clone())
             .group("")
             .flex_none()
-            .h(self.size.height())
+            .h(self.height.unwrap_or(self.size.height().into()))
             .when_some(self.width, |this, width| this.w(width).justify_center())
             .when_some(self.rounding, |this, rounding| match rounding {
                 ButtonLikeRounding::All => this.rounded_md(),