Allow UI font weight to be assigned in settings (#12333)

Release Notes:

- Added the ability to configure the weight of your UI font in standard
CSS weight units from 0 to 900.

crates/ui_text_field/src/ui_text_field.rs

@@ -125,7 +125,7 @@ impl Render for TextField {
             font_family: settings.buffer_font.family.clone(),
             font_features: settings.buffer_font.features.clone(),
             font_size: rems(0.875).into(),
-            font_weight: FontWeight::NORMAL,
+            font_weight: settings.buffer_font.weight,
             font_style: FontStyle::Normal,
             line_height: relative(1.2),
             color: style.text_color,