fix(colormap): update opacityMapping to opacity and use simple list renderer(#3464)

Co-authored-by: Alireza <ar.sedghi@gmail.com>

extensions/default/src/Toolbar/Toolbar.tsx

@@ -29,7 +29,7 @@ export default function Toolbar({ servicesManager }) {
 
   return (
     <>
-      {toolbarButtons.map((toolDef, index) => {
+      {toolbarButtons.map(toolDef => {
         const { id, Component, componentProps } = toolDef;
         // TODO: ...