Fix UI font size changes not applying (#25307)

Related to #24857.

Release Notes:

- N/A

crates/repl/src/notebook/cell.rs

@@ -186,7 +186,7 @@ impl Cell {
 
                     let refinement = TextStyleRefinement {
                         font_family: Some(theme.buffer_font.family.clone()),
-                        font_size: Some(theme.buffer_font_size.into()),
+                        font_size: Some(theme.buffer_font_size(cx).into()),
                         color: Some(cx.theme().colors().editor_foreground),
                         background_color: Some(gpui::transparent_black()),
                         ..Default::default()

crates/repl/src/outputs/table.rs

@@ -94,7 +94,7 @@ impl TableView {
         let text_system = window.text_system();
         let text_style = window.text_style();
         let text_font = ThemeSettings::get_global(cx).buffer_font.clone();
-        let font_size = ThemeSettings::get_global(cx).buffer_font_size;
+        let font_size = ThemeSettings::get_global(cx).buffer_font_size(cx);
         let mut runs = [TextRun {
             len: 0,
             font: text_font,