ui: use native IconCopySmall24 to match size/weight of sibling icon buttons

src/ui.tsx

@@ -9,6 +9,7 @@ import {
   IconExpand24,
   IconCollapse24,
   IconCheck24,
+  IconCopySmall24,
   useWindowResize
 } from '@create-figma-plugin/ui'
 import { emit, on } from '@create-figma-plugin/utilities'
@@ -171,14 +172,7 @@ function Plugin () {
               title="Копировать значения переменных"
               onClick={copyInfo}
             >
-              {copied
-                ? <IconCheck24 />
-                : (
-                  <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" xmlns="http://www.w3.org/2000/svg">
-                    <rect x="9" y="9" width="13" height="13" rx="2" ry="2" />
-                    <path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1" />
-                  </svg>
-                )}
+              {copied ? <IconCheck24 /> : <IconCopySmall24 />}
             </IconButton>
             <IconButton
               title={isMaximized ? 'Свернуть окно' : 'Развернуть окно'}