fix(FilterableMultiSelect): fix extra colon (#19428)

* fix(FilterableMultiSelect): fix extra colon

Minimal fix for extra colon in hidden "Total items selected: : 0"
message.  Note that it already worked correctly when one or more
items were selected.

I don't like the way FilterableMultiSelect adds hidden text to
the label, but aria-describedby is already being used to point
to the (visible) helper text.

Fixes #19424.

* fix(FilterableMultiSelect): remove duplicate cds--visually-hidden span

Fixes #19424.

Author: wkeese

packages/react/src/components/MultiSelect/FilterableMultiSelect.tsx

@@ -861,16 +861,9 @@ export const FilterableMultiSelect = forwardRef(function FilterableMultiSelect<
     : {};
 
   const clearSelectionContent =
-    controlledSelectedItems.length > 0 ? (
-      <span className={`${prefix}--visually-hidden`}>
-        {clearSelectionDescription} {controlledSelectedItems.length},
-        {clearSelectionText}
-      </span>
-    ) : (
-      <span className={`${prefix}--visually-hidden`}>
-        {clearSelectionDescription}: 0
-      </span>
-    );
+    controlledSelectedItems.length > 0
+      ? `${clearSelectionDescription} ${controlledSelectedItems.length}. ${clearSelectionText}.`
+      : `${clearSelectionDescription} 0.`;
 
   return (
     <div className={wrapperClasses}>