fix: update screenshot.js DOM text reinterpreted as HTML

plugins/dev-tools/src/screenshot.js

@@ -58,7 +58,7 @@ function workspaceToSvg_(workspace, callback, customCss) {
   // Go through all text areas and set their value.
   const textAreas = document.getElementsByTagName('textarea');
   for (let i = 0; i < textAreas.length; i++) {
-    textAreas[i].innerHTML = textAreas[i].value;
+    textAreas[i].innerText = textAreas[i].value;
   }
 
   const bBox = workspace.getBlocksBoundingBox();