[css-forms-1] Fix double borders on sliders (#11984)

Removes borders from slider container elements.

Author: lukewarlow

css-forms-1/Overview.bs

@@ -800,14 +800,12 @@ progress {
 
 ## Layout ## {#stylesheet-layout}
 ```css
-input:not([type=file], [type=range]),
+input:not([type=file], [type=range], [type=checkbox][switch]),
 textarea,
 button,
 ::file-selector-button,
 ::slider-track,
-select,
-meter,
-progress {
+select {
   border: 1px solid currentColor;
   background-color: transparent;
 }
@@ -1034,8 +1032,8 @@ select::picker-icon {
 
 <h2 class=no-num id=changes>Changes</h2>
 
-<h3 class=no-num id=changes-20250325>Since the 
-  <a href="https://www.w3.org/TR/2025/WD-css-forms-1-20250325/">First 
+<h3 class=no-num id=changes-20250325>Since the
+  <a href="https://www.w3.org/TR/2025/WD-css-forms-1-20250325/">First
     Public Working Draft</a> of 25 March 2025</h3>
 
 <ul>